Lucky 7's

[morgant]

I recently took my father to foxwoods. He played blackjack while i was in the poker room. He was playing and doing okay when the lady next to him convinced him to place the dollar on the 7 bet. If he got one 7 it paid 5-1, 2 50-1, 3 500-1, and 3 suited was 5000-1. He hit 2 triple sevens unsuited within 2-3 hours. First off we discussed a bit about the odds of him making that exact hand and i was wondering if one of you probability afficianado's could give me the right number, and also how terrible are the odd's the casino pays vs. the probablity of hitting those hands???
thanks
Morg