So basically every dice site that has an investment option, if you win or find a flaw in THEIR PROGRAMMING they reverse the bets and you lose. Just look at PRC. Look at that other one that ran off with 250+ BTC.
Simply put, as a player if you win big, you don't win big. They cancel your bets or find some way to say they were wrong and you 100% definitely knew you had an edge (you can't just be lucky) and thus you lose all you're winnings.
SO THUS, DONT play on sites with house investments.
Honestly, take it from my own experiences (5 BTC to 75 BTC to 0 BTC in one session) DONT DICE AT ALL.
And definitely don't dice on Primedice, the most rigged site ever (yeah you still havent changed the problem i pointed out a year ago in your "fair" system)
If you must dice, I'd say coinroll.it. But again, I don't dice anymore and neither should you...
You are right.
The even worse part is that, in a house with investment option, there could be some inside job, like what JD did with the nakowa account.