Last couple of days I've encounterered several regs that have 4bet shoved me where the standard is to 4bet smallish.

Example:

Villain (BT) Opens to 2bb

Hero (SB) 3bets to 7bb

BB folds

Villain Shoves 100bb

I've called off a few times to see only value so far AA + QQ (small sapmle obv). 

What's this about? Seems totally rediculous to me since villain is making it pretty darn expensive to 4bet bluff

Some new coach on another site that's doing this?