There is a slot carousel that exists in serveral casinos in British Columbia. It has a totally random hit among the 12 slots in the carousel of $10,000. There is a counter that starts at 1000 and could go as high as 20,000. The amount of the counter does not effect the value of the random payout, it is always $10,000. The payout must occur by the time the counter hits 20,000 but can and does occur at much lower counts. The machines are penny machines with minimum coin in of 20 cents and maximum of $1 per spin the amount of coin in does not effect the odds of winning the payout. The counter goes up about 60 points per hour depending on coin in from the carousel. The counter on the carousel at my local casino hit 19,000 today. I told my wife (since I don't like slots) to sit and play until it hit. She had about $140 in after 3hrs of play when it hit with the counter at 19,170.00. Was this an AP?
Is this jackpot linked to the other casinos and are you sure a max bet isn't required to win?
As with any promotion, its designed to get people in the door and to keep them playing at the machines since active play was required with the previous sixty seconds.