I did watch a programme on SKY television, i cant remember the exact name of the programme but it was about trying to cheat the casinos. These 2 guys went in to the slot machine areas and would play a slotto for a while and when they had a bit in the bank would press collect. Now at this point they would stick this "light wand" up the payout chute, and according to this documentary Casino slot machines pay out using Infra red light beam technology. The theory was every time a coin broke the light beam it would know it has payed that coin out and the light wand would interfere with this so the slot machine did not know it had payed out and would just keep dropping coins until it emptied the hopper.
Now 1 of the guys was being a bit sly, but the other was going mental, just emptying machine after machine like no one was watching BUT they caught him on security camera using the light wand and they busted him and his partner as they left the casino. It turns out that it was all pre set up' the casino agreed to let them try to rip them off just to see if their security was good enough to catch them. Thinking about it the programme might have been called Beat the Casino or something similar.
I know i may have strayed off the point slightly but i was just trying to say that there are devices around that can make slot machines pay out, unfortunately though not in this country.
I saw one of the episodes from that series that had a pair of guys who used to work the 'card counting' scam. They made a fortune from Blackjack by having a system where they knew what the number was of the next card. They made mega bucks. It made them both millionaires. Obviously they worked it in the big casinos and didn't bother with the smaller ones.
Speaking of laser emptiers i had heard that you used to be able to fiddle some machines using a laser pen. It had something to do with pointing it at the outside edge of the first reel. But it only gave you credits as opposed to actually dropping them. It doesn't work on any of the new machines though and most of the old ones have now been chipped.
A bloke i know apparently got told about it from a fruitie engineer, it went on for a while before the scam was rumbled. Personally i don't see how it would work. It had something to do with one of the machine sensors on the reels but i wasn't aware there was one?