Investment requires the right ethics and principles before you can be profitable in it and  I don't really understand what you mean by "wise people can't do things by following the right rules" but however, investment is all about risk so you must have it at the back of your mind that there are possibilities of losing despite the fact that you are seeking to make profits so that in a situation whereby the market doesn't work out the way you planned then you can be able to manage yourself without going through emotions because as an investor you don't actually need emotions because though your chances of making profits why investing on some assets like Bitcoin is high but as well there are unforeseen circumstances that surrounds the scope of the market such that it may not actually work the way you thought it would be all the time so it will help you to restrategize in a case where you run into losses.

Your investments can yield you profits no doubt but that doesn't implies that profit would be guaranteed all the time because sometimes you need to risk some assets in other to stand the pressure of the market because there are times when the competition would be so high so at that time what is needed is more valuable assets so in other to acquire such valuable assets would require to sell off some of your assets and purchase the one that is more valuable that why it is good to invest on volatile assets like Bitcoin because you are aware that it wouldn't get devalued so easily and as more people are becoming interested and acquiring it that's how the worth increases and values increases as well so in such situations profits can be guaranteed