2) That could be used quite easily if you're the guy in the shop and you encourage people to scratch right there in front of you. If it's one out of 20 you barely need any info to come up ahead, since the odds/payout is probably within a few % of breakeven and each card starts at 5% of the pack. One or two losers and the rest are worth +ve, alterntively a winner and the other 18/19 are worth even less -ve.