I systematically sell about 1% of my holdings for every 10% rise in price, and I buy back in similar amounts.
I have been employing my system since about $250 all the way up to current prices $3450 [...]
You should for all newbies make a disclaimer that your 'system' requires you to have your bitcoins at a third party exchange. And as you know by personal experience (Bitfinex, BTC-e) it is very likely you eventually lose those bitcoins 'stored' on an exchange (hacked, human error, government seizure, inside job, etc etc). Not even mentioning the Bitcoin Cash you have not received by not owning the bitcoin private keys.
I am not sure why you are wanting to create some additional requirements upon me based on your own thoughts about the topic? You seem to be talking about post style and discretion in posting rather than material and relevant substance, no?
In the past, you and I have also had some differences of opinion regarding what I am doing in terms of whether I am gambling or if I have a systematic strategy, and you seem to have some difficulties differentiating between what I am doing and gambling... so I have to take any of your recommendations with a grain of salt.... furthermore, it seems that in the end, you want my walls of text to be even longer and more incomprehensible? hahahha
I doubt that I need to issue any disclaimer, and you seem to want to suggest that I have some kind of responsibility to issue investment advice in the arena of personal details, applicabilities, risks, timeline, financials, blah, blah, blah, for supposed newbies who might follow some variation of what they perceive to be my strategy.
As much as you want to characterize, I am not issuing investment advice, and anyone on the internet needs to come to their own conclusions based on their own parameters rather than relying on what someone says in the interwebs, even though I am talking about what I do, and attempting to share information and to brainstorm regarding my ongoing relationship with BTC, and related topics.. .
In terms of the substance of your point, you are correct about the existence of third-party exchange risk, and some other associated risks that go with engaging in a practice of trading, including moving money around and also the fact that it can be very time-consuming to employ some of these trading (and investment protection) strategies... so yes there is some opportunity costs as well.
My previous response post was not discussing every single aspect of trading, the positives and the minuses, and was not meant to be any kind of comprehensive rendition in any kind of way, so there are going to be varying priorities and a lot of other individual variations that were not within the scope of my earlier off-the-cuff response.