No I don't lol. You lose t2 mex and you lose t2 mex reclaim. There is nothing a dude gains from getting tml'd in any way. If you kill more mass than the attack cost you, then you have a relativist mass lead.
1 T2 mex kill is all a TML needs, the opportunity cost is irrelevant, it's always good ceterus paribus.
The only opportunity cost to worry yourself about is the cost of going t2 at an early stage in the game, but this is already common on many teamgame maps anyway and serves other uses than just simple tml abuse.