If you are here, I would assume you are into bitcoin and learning how to use it. put your receiving address in your sig, at least have one on your profile page. Anyone with btc can send you some love directly from their wallet. Things like changetip are for n00bs and people who have no knowledge of how bitcoin works and is really meant for platforms where you don't know who will come across your content. Its made to facilitate and introduce btc. Is redundant here.
So you're saying tipping should just be exploited to introduce new users but is not actually useful as a service? If so i'll have to disagree. As having alternatives in place yes i agree, i can look it up in profile, i can also ask you for your address in PM, and instead of this forum we can write letters to each other... Would i ever do it probably not, would i click a button for insightful analysis and a good post, probably.
All arguments so far seem to fall into:
1-You already have a way to do it so why simplify make it user friendly.
2-Cons outweigh the pros (spam beggers etc...)
Which both i disagree with. Would love to see BTC as a standard tipping feature on all forums (sort of like saying Thanks for a post on some platforms). Sure some platforms might benefit more than others (thinking of stackexchange etc...) but still
No no no, I did not mean to say tipping is for n00bz or as a gateway to introduce btc. I meant Tipbots and Changetip are for nOobz to get in on the game. They are great things for that, absolutely.
What I am saying is; we here know our BTC a little better than say your granny or who ever. I would hazard a guess that 99% of users here are capable of operating a wallet, sending receiving Btc, and posting an address. A bot is unnecessary.
EDIT- tipbot would be convenient though, however, I like that all I need is an address to send btc. Back to basics and good for new guys to come to terms with. For a while I had an address on a blog I run, with a "tip me" label. Not that anyone tipped the blog, I was still happy with the simplicity. It is not a btc related blog so a Changetip button sits there now. Users still have to get BTC and a CT account.
ah! Happy to pick up the slack <3 
Now we just need someone to slap them up and we are moon bound!
)