3-way Question

[BoxTree]

3-handed, Commerce 20/40 (Unlikely for any sustained period of time, but we managed to play for two hours.)

Button raises in the dark every time (eh...every time he has the button).

I'm always in the big blind here.

Small blind almost always 3-bets or folds.

When SB folds, aren't I correct to call with any two cards since I'm getting 3.5:1?

And shouldn't I only be 3-betting with hands that have a clear equity edge against any two random cards? Since the button can't re-raise if I just call (remember, this is a dark raise and NOT a live straddle) and isn't going anywhere if I 3-bet, I think this is my preflop game.

Assume that he's equally good (or bad) as me postflop.

This look good?