Honestly, has anyone
ever seen an advertised gambling offer that is truly fair/completely honest down to pure, unaltered luck with a mathematical correct chance to win in relation to investment ?
The operators of these make money (they have to), so gambling is
always about carefully & invisibly tilting the table towards the bank. That's the dirty secret behind
anything gambling, not much unlike a magician that makes his money fooling people's senses. It's all just about hiding their tricks and presentation/manipulating attention and perception.
I haven't seen a 100% legit/fair gambling service in my whole life and don't expect to ever see one. The most legit ones just skin their players a little enough so they don't feel it and return to the game.
And these "pay more and more to win" schemes are just among the most plain scams in existence
(additionally, on the internet the whole thing becomes much more intransparent and easy to manipulate - in the special internet niche of Bitcoin the scam/skimming probability of ad-hoc/questionable offers is about 99% - which is a rather optimistic estimate)
One would have to be completely blind of greed or downright retarded to fall for such a simplistic scam. But all it takes is 1 out of 1000, that's what these scammers are looking for.
Maybe that's why scammer rhymes so well with spammer - both are looking for the occasional fool in the masses they can rip off.