From my experience, a lot of gamblers that I know both online and offline don't really trust the math.
When we have several 1% dice sites, some people enjoy playing roulette which is essential just a higher edge dice game with more restriction (only a few win chances to choose from).
We had quite a few people at Just-Dice asking when I would add roulette... I tried explaining that roulette was just dice with less choices of payout and a much bigger house edge, but they don't care.
When you have a roughly 50/50 chance of doubling your money or losing it all, you don't care if the chance is 49.5/50.5 or 47.3/52.7 - it's still pretty much 50/50.
And maybe it's all fate / lady luck / karma to the gambling mind anyway, so the probabilities themselves don't matter at all.