Do you want to have 100% in steem and than something go wrong?
No of course not, and I'd understand it if some accounts are only investors and curators. It was more about those that are actively posting and earning a good deal of SBD which at current prices rewards you a lot and let's you reinvest into other things - hence those that are doing both is what is a bit confusing to me. There are some accounts even with barely any SP left keeping their posts alive by votetrading with bought or free delegation which seems to me like its the biggest form of value leech of the platform I've ever seen.
You're right. I was supporting many guys for months just to find out they had the same amount of sp after all that time. I simply moved on. The system is evolving and changing constantly. The smart guys will profit the most on the end.