So when you should have a 75% chance of success, and fail 7 our of 10 times, then 4 out of 5 times....the average rate now is 30% and 20%. This is a constant problem for a lot of people, except those that seem to be blessed with the un-shown magical high luck and win most of the roles and rarely have this 'stuck on failure' issue most have.

It comes down to this, if it's broken, if the players...aka paying customers...feel they are being cheated, at some point they stop paying. What would happen to those few blessed people with high luck do when you loose a large portion of your population on the servers? Why pay to be cheated? This isn't Los Vegas where the casinos are rigged, as in designed for you to loose...at least that isn't what any of the advertizing implies. If the rng is going to fail, get stuck on failure and cheat us, it might get lonely if we stop paying to be screwed.