2-7 triple draw question

[MarkGritter]

I admit occasionally playing hands like 337 or 773 from the big blind vs. a single raise, but I don't play them from the SB because of the possibility of a raise from the BB. Paying 1.5 SB is too much to try to catch a 2, or to draw to 873 OOP.

The question you have to ask yourself is what happens when you catch a 4 or a 5. Do you continue drawing? If so, it can be a major leak. You are unlikely to see the second draw for free. (Something like 734 or 7345 is still bad to draw to, but at least drawing 1 or 2 cards will often let you see another street for free, or have some folding equity.)