Seems like you haven't read up on the basic gambling fact "You never win, house bites you in the end". So adressing your comments-
Yes, they do rip you off, well rip off is not exactly the word but you are always expected to lose in the end.
Yes, that is variance, while you are in positive variance(if you don't know what that is, look it up) you may leave gambling and still be in profit, but if you keep playing -EV(Expected variance), which means that you will loose your money in the end(to short it up), will make you lose your btcs.
Then there wouldn't be gambling sites at all, gambling sites work so that they may make money out of your money, and BECAUSE of the house edge they do, yes there might be quite a few people(maybe even you, thats why you are defending this point furiously) who have made something out of gambling, but if there is negative EV, its random if you win or loose, then you are expected to loose in the end.
Yes it is, seems like you got in at the wrong time, sometimes couple of highrollers may cause the site's profit to go down, and if they cashout then it may remain in loss, if not once again, there is house edge which will bite them. And the site's bankroll never clears out, if they have the correct implementations of Max profit.
Firstly, EV doesn't mean "expected variance", it is expected value.
Now, the idea of "always reaching expected value" will happen if and only if you bet an infinite amount of money.
I could bet 10 bets and be in the positive.
I could bet a 1000 times and be in the positive.
I could bet 10 million times and still be in the positive. Is it likely? No. But is it impossible? No.
There are more people that lose than win.
But, that does not necessitate that the dice sites are ripping you off and as you say "You never win, house bites you in the end"
That is not a basic fact, because that is not a fact. Provide some backing before you say stuff like that.