Since Raffler its a good way to draw zeny from the players, as your way to tackle inflation, many players just do not do it due to the odds of getting the item. With a 4 digit random number generation, it means (and we assume) 1 out of 9999 possible combinations, 0.01% of getting the item, thats a card drop rate. If this rate its higher or lower, idk, I sucks at math. However, I think we will bet higher if we got 1% chance to get the item, so my suggestion is make it a 2 digits random number, from 1 to 99, even with 2m cost, surely can pay that.