mark a video poker machine could be altered in a matter of minutes. those that play at sienna , especially the higher denominations should report back with their winnings and losses. everyone in the higher denominations will be signicantly behind in money and royal flush averages.
siena
It's actually SieNa (one N)
I've never played any higher than 10c and 50c there (8/5 JoB with progressives in 10c variety; 9/6 JoB in 50c variety)
I have heard of 5 Royal's hitting in the past week there from usual players...so I would think your theory is skewed just a bit.
As for myself, I've never hit a royal there, but I don't play a lot of vP, but last weekend I DID hit a Straight Flush, which is a kind of rare hand.