I'm going to go out on a limb here, and guess that Daniel probably doesn't care. The people that are really important, and that he really needs to please are gamblers, which are his actual customers. Bankroll investors are just a means to that end (i.e. make sure the limits are high enough, and the site can smoothly operate through huge profit swings, etc). And according to the stats, Daniel has already paid  investors  3875 BTC  for their services (i.e. averaged out to 176 BTC a month?).

Since I have no shame, and don't mind making an ass of my self speculating -- I'm going to guess he looked at that number, and realized since the size of the bankroll is already bigger than it needs to be -- and decided he'd rather just keep some of that money for himself. He probably realized he couldn't easily raise the %-of-wagered commission, because that would lower the max-profit by a lot, and put too much variance on investors who would be tempted to divest, which could create a vicious feedback cycle.  So switching to % of profit, makes a lot of sense. It means that max-profit will go *up* unless more than 1/3rd of the investors divest -- which seems highly unlikely (afaict, actually there's been 1 more btc invested than divested since he announced the change).

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From a personal perspective, I'm a bit of two minds about it. It's sad to watch these great investing opportunities diminish (or even go away, like yolodice recently) but it's also nice to see these businesses mature too. The vast majority of crypto projects that ask for "investments" are so focused on getting investor money, that they lose sight of creating a viable business.