I considered doing a similar version of the Random Walk calculation, but without in-depth knowledge of the mathematics/programming behind the floundering of guardians decided to go with my purely empirical approach. Since I took nothing into account other than the final position of the guardian, it simply doesn't make sense to apply the type of adjustment factor you're proposing. I do, however defer to your opinion on the expected outcomes of the casino, although in my humble opinion the roulette table will be unplayable unless it falls within approximately .9 to 1.05 expected values ranges

@OtherGreenGamer Here's the thing, this isn't a real casino. If I'm going to lose more than I win, and if I win I won't gain much anyways, then there's no point to play it at all. If you want people to actually play it, since this has turned like 90% of the players off, I'd recommend doing what Cepheid has suggested. Otherwise the main player base probably will barely ever go back there.

I second this
Since this is not a real casino a "house win" doesn't matter at all (only meaning a loss of crafty coins) and just adusting the values to make it as random as possible, would be more luck based, and maybe more enjoyable.