The bluff with 7 2 is a bad idea. Three things can happen.
1) You make a hand (not very likley)
2) You manage to get someone to call your bluff.
ii) now you gotta risk more to force them out
iii) Or you gotta make a hand (see 1)
3) You get them to fold. You win blinds (there are much better hands to do this with)
I don't understand why everyone gets all excited to win a hand with 7 2 or even bluff and show it. Same with 10-2.....so it's famous....but you didn't make it famous so quit pretending it's god's gift to poker. I'm sure doyle doesn't even recommend playing 10-2 all day long, and definitely not 7 - 2