This is a good point.

Also a good point is that it is impossible to make a "pure bluff" PRE. It is not possible to be "drawing dead" at this point in the hand.

If you have 72o vs. AA, you've still got 11.8% equity.

Against a 10% range of { 77+,A9s+,KTs+,QTs+,AJo+,KQo }, 72o has 24.5% equity.

Now, given 5 Villains who fold 90% pre and no other information,
if you bet 3bb w/ 72o:

0 callers: 59% ; pot: 1.5bb ; equity 100% ; EV 0.89bb
1 caller : 33% ; pot 4.5bb ; equity 24.5% ; EV -0.38bb
2 callers: 7.3% ; pot 7.5bb ; equity 16.5% ; EV -0.092bb
3 callers: 0.81% ; pot 10.5bb ; equity 13.0% ; EV -0.010bb
4 callers: 0.045% ; pot 13.5bb ; equity 11.1% ; EV -.00053bb
5 callers: 0.0010% ; pot 16.5bb ; equity 9.9% ; EV -.000011bb


Total EV: 0.40bb

So, if these hypothetical Villains all play the exact same 10% range (the one I gave above), and Hero bluffs w/ 72o from UTG, and Hero plays well enough to realize at least as much equity (by outplaying these nits post) as his hot-and-cold equity, then it is quite clear that Hero can bluff with ATC and win major monies.
Spoiler:

First column, likelihood of n callers

x = 90%^(5-n) * 10%^n * (5,n)

where n = { 0,1,2,3,4,5 }, and x is the likelihood of n callers.
Also, x is used in the EV calc.

the notation (5,n) means "5 choose n" or "n combinations from a set of 5"

EV column
EV = x * ( equity*pot - (1 - equity)*3bb )