You have the point but that is why I think game shape should have something to do with it. This is how I see things:
TIE/win.........enthusiasm- up, game shape -up
You tell the guy to take it easy. The don't get tired for the next match (game shape -up) and they are very happy after winning with low effort.
TIE/lose..........enthusiasm slightly -down, game shape -up
I don't really see any logic behind someone feeling better after a lost game!
CT/win..........enthusiasm slightly -up, game shape -down
They give their best, run all over the place and their GS goes down for the next game. If they won it, their team spirit must be even stronger then before!You can ask: ok, I CT all the time, I win all the time and my enthusiasm goes up. There goes the game shape factor that will not let you do this!
CT/lose.........enthusiasm -down, game shape -down
All clear here I suppose.
I fear this will make prety sure nobody will want to TIE anymore
I think you will agree that people TIE much more now, than they would in the real life, but on the other hand, getting your game shape up can be a sensible investment in such a risk.
Generally speaking, this TIE/CT thing shouldn't be as straight forward as it is now. It has been way over-exploited in my oppinion.