What about "slot machines" in casinos and in hell? It is exploit or feature? Because i see all the time players playing it.
No an exploit, just an easy way to get some money (if you have Gambling raised to 95%). Money in casinos are limited (refreshed every gaming week), so they don't influence game economics too much. But if you happen to come while the limit is not yet spent, you can get rich quickly. This is the reason why people gamble in hell ("gamble in hell" - what a weird phrase...) - there are only few players there, so the chance the limit is not spent is high.
Oh, and you can get some jackpots - up to your bid * 1000. But the chance for it is 1 in 1000...