I didn't refer to those 10% but to what seems like a huge investment of time and effort - time and mental well-being are the scarcest "asset" we have and too precious to be directly exchanged for moneyIt’s the reality. You don’t make any more than that unless you’re lucky (and luck eventually vanishes).
no disrespect whatsoever to @jafo and all those who are willing to get their hands dirty to learn, get experience or build up some capital but everybody should at least try to find their unique niche and let the money/contacts/software/others/... work for them as there is always time to have two jobs and spend their life "at work"