Given that the trade seems pretty apparent, at least to me. "You can use our thing here for free but in exchange we might want to use one of your things later a

Given that the trade seems pretty apparent, at least to me. "You can use our thing here for free but in exchange we might want to use one of your things later also for free", I have to ask why you don't think not agreeing to the latter half of the deal shouldn't preclude you from the former? I mean, that's how deals work.