Those scams make me so mad as well. I have always had great luck with scratch offs though. This Christmas I got a few in my stocking and one of them won $100. A couple years ago I won $250 on a Monopoly ticket and several times I have won $35-$50. My bf always jokes with me and when we want to go out for a night he says "let's stop and let you buy a scratch off so we can pay for dinner"
I wouldn't actually call it a scam. If there is only 1 prize but the game goes on for 6 months, someone is going to win the prize! Whether they win the prize in the first month or the 6th month is a matter of luck.
Now, if they kept the game going for 2 yrs beyond the big prize, then it would be a scam!