Hey!
I completely understand where you're coming from, it's why i stopped trading around the end of 2014 with games/skins/cash, it was just too much of a hassle having to vet everyone constantly, being on the defensive and untrustworthy of everyone i came across, having to trust in people to then just be scammed - especially at the beginning when i didn't have any rep to fall on, etc. I don't have any +rep outside of my steam profile unfortunately.
Steamtrades.com has a rep system implemented on the website but around the time that i was trading heavily (mid-2012 to about late-2014) it wasn't popular, and the main source of whether you could trust someone came from their +rep on their profiles - so i copied the trend. In hindsight i should have also used the websites rep system, people even offered to +rep on my profile on the website at the time but i declined and was satisfied with simply getting their +rep on my profile, and it's perhaps my biggest regret because i have become aware of how worthless profile rep is now since being easily abusable - and how the steamtrades.com website rep system is now well-known and well-trusted in this day and age.
Here's what i can vouch on though; almost ALL, if not ALL of the +rep i have on my profile has come from profiles with 1000 times more rep than i have on my profile, since i was mainly trading very trusted and popular traders at the time, since i mainly was going first in those trades and wanted to minimise the risk by only trading people who already had a substantial amount of rep, and those people with crazy amounts of +rep more than likely have crazy amounts of +rep on their steamtrades.com profiles - i can link you my profile in pm's or on discord (but not publicly since it's against steam ToS to even trade/sell steam accounts) and you can check them out for yourself to verify this.
Furthermore, the +rep comments i have vary, again, from mid-2012 to late-2014, so i would have had to have been very dedicated to fake those +rep comments as timely as to be spread out over the course of 2+ years. But i do see your point. It's an easily exploitable rep system to abide by and put your trust in, i wouldn't even trust it anymore if anyone approached me with that as their backing of trustworthiness, especially since any +rep i have after late-2014 (about 5 or 6 +reps) are just from people who i played with in CSGO and they +rep'd me for being a good/friendly team mate, hence why i'm not offering it forward as proof of my trustworthiness, but rather just to avert any scammers intentions by showing that I have been in the online-trading world for quite a few years, specifically in the games department, and am very aware of all the various scams.
So ultimately i don't have any rep or proof of my trustworthiness. And i am not trying to use my +rep on my steam profile as a form of that, as mentioned.
Regarding Paypal; To avert the risks and challenges that come with chargebacks I prefer just getting a paysafecard that can be purchased with paypal like any other type of giftcard. It's like if i wanted a steam gift card instead of paypal cash, it shouldn't be a problem for a buyer since they can buy said gift card with paypal anyway - and it poses the same level of risk for the buyer, someone has to go first.
And lastly, in regards to the account itself - even if i didn't go first, and i trusted in the buyer to pay me upon giving all the account info, original email address and password, etc - as you said there's nothing stopping me from retrieving the account via support. That's just the risk that comes with buying an account for ANYTHING unfortunately, as I'm sure you're very aware of. There is literally nothing i can say to you in regard to that to add to my character as a person, except it's just about being a person with morality and not a disgusting scumbag. Especially over £25. I mean who is that desperate for £25 that they're willing to scam someone over it. That's just not me, but again, you can't really trust anyone these days.
I personally wouldn't even buy an account online myself because of this very exact same risk, but i figured since I have rarely touched the account and I have no intention to ever touch it since I increasingly have less and less time for entertainment anyway, let alone games, why not try to make a bit of money out of it and have someone benefit from it for it's fair pricing, rather than let it rot until the contents of the account are worthless and outdated. The truth is you can't really trust anyone with 100% certainty. I don't really know what else to tell you in that regard.
Just know that there's some of us out there that do believe in morals and have a sense of self-respect.
EDIT:
While i was near the end of this message (typing it), i was added on discord by someone from another website where i was also advertising the account. I have now sold it, sorry. I'm not sure if i'm allowed to link other websites but i will take the liberty to do so to show confirmation. It is another well-trusted website for trading accounts.
Here:
https://www.playerup.com/threads/steam-account-cs-go-with-1k-hours-and-many-more-games-very-very-cheap.3575229/#post-9205101She went first with the paysafecard, i redeemed it, then gave her the account. Yeah, i could retrieve the account if i wanted to, at any point, but I wont. Just know there's people out there like me. Again, this is probably a pointless read but i wrote it all prior to getting the discord invite and didn't feel like deleting this all. Sorry again and i hope you find what you're looking for.