BB defend NLCASH

[TheFan83]

Ok i saw cwar actually folding A7o in the BB in his hu video vs a 3xbb raise.

Obviously hes a great player so i think might underestimate the reverse implied odds concept.

But heres my thought about BB defend..

Lets say you call with A7o, KTo 22-55 etc. 15%
and reraise with AT+, 66+ and sometimes other stuff to 10%

So you are acutally folding 75% of the time!

My point here is that i get far too much value in the small Blind by simply raising any 2 cards.

lets say i get 72o in the sb, hows my value of raising:

75% of the time i gain 1bb so thats +0.75bb value
10% of the time i loose 3bb so thats -0.3bb value
15% of the time i see a flop with as a hopeless underdog, but in position, but i still have at least 33% equity of the 6bb pot = 2bb = loss of 1bb = -0.15bb value.

So thats 0.3 bb raising value of 72o instead of loosing the 0.5 bb by folding of course!

In a perfect world i would imagine raising 72o isnt profitable, with that underdefend its superprofitable.

Vs an Opponent that limps the button quite a bit an seldom raises it i think its ok to fold A7.
But an Opponent that comes in for a 3xbb raise as Standard and raises about 50% of his cards lets say, you got with A2o 50% equity of the pot.
Folding looses 1bb.

So heres my question is the reverse implied odds really making up that much? I cant really imagine that.