Any pseudo-randominess is irrelevent in the context of a MMORPG, because you don't get to reserve your own dedicated RNG. If there's a MMORPG coin simulator and all it's doing is alternate between heads and tails while serving thousands of clients, there's no way any particular player to detect any pattern unless you managed to request 2 coin flips without anyone else making such a request in between. Even if any pattern exists, it'd be wiped out by the fact that while you're attempting to gather at 50% 5 times, thousands of players would've spammed the RNG with completely unrelated requests between your attempts and stealing whatever rolls you were hoping to get. The RNG is just handing out numbers on a first come first served basis, and you can be assure there's a whole mess of guys that's taking these numbers between any two actions you might attempt.