my first thoughts when i saw the title was, rofl, but after reading, its just a lol.
Seems like a decent chance for some dodgy people to make an easy 20k. It really isnt hard to make quality fliers, even if your a dumbass drug dealer. It means the person who dropped the card can be very selective about who meets where, they could name 20 locations for 20 people with 2k cash each, and i doubt they take Visa. Not like if you got robbed you could go to the cops "yeah i was invited to this illegal organised street race for the chance to win 20k by dragging my illegal car down a public road, and i got mugged, help"
Sounds, as Troy said, more like an American cop tactic. Sapol has bigger shit to deal with.