the advantage of playing on a known and relatively big casinos is that you have the assurance that you will get paid even if you win big. the dilemma of some players when they win big is that if the casino will ever pay them. this is not a worry when you are playing in a reputable top casinos. but if you are a small roller, you can definitely hop from one casino to another and explore your opportunities in terms of bonuses and rewards, just make sure you have read their trust summary or feedback to avoid losses without a fight.
But, I think that not all rich people plays for a profit but some only wants entertainment so they aren't really picky and won't only pick casinos that are big or at the top. Small gamblers on the other hand can also focus on big casinos because they think that the bonus there is much better than the other which aren't really big enough.
There also a positive impression about rains which is true in the case of stake casino because diamond players there are raining big amounts before but anyway people shouldn't focus only on those things but it will be better if they will also deposit their own hard earned money so that casino owners won't feel bad about them.