No it isn't.
bustabit's bonus system means that it is possible to play a +EV strategy and so have a positive profit in the long run.
That is what people keep trying to tell you: taking advantage of the bonus is the only way to have a positive expectation in this game.
I know you run your own casino site and know more then I do but how can what you say be true ? If it was then wouldn't bustabit be losing money ? How can mathematically ot be plausable to male a profit. Its suppose to be the other way around otherwise the house won't make money since it is a business, which of coarse you already know ^^
Because that bonus isn't from the house, it's from other players.