From what I read, you can only enter up to 94 times. So worst case scenario: 94 plays x500 points = 47,000 points. But simply going by the published odds, you would almost be certain to hit a larger prize at least once.

Postage, index cards, and envelopes should come to about $50. Not bad for 47,000 points - especially if they're elite qualifying.

Food for thought for those of you traveling alone and far away on business with nothing to do :-)