Eh, no, there should still be a tomestone/mark/exp reward. Lihtleita has the right of it, people would abandon a match en masse once they realize they have no chance... Hell, some would leave after the 1st wave of objectives resolved if they see that their team did poorly.

::looks at OP:: Oh wait, it's you... That explains everything.

I do think that the reward for being first place should dwarf being last place by a wide margin, with second place somewhere in-between. I still stand by the idea of them implementing a new token/currency that you only get from winning/getting second place to trade-in for new rewards. The new Trophy Crystals somewhat exemplify this- and I'd argue that they could let the winning team earn 100 Trophy Crystals per win as a second outlet to (slowly) accumulate them, since a lot of new things are locked behind a thousand or two Crystals...