To be clear on the rules... You can swap franchises, but I'm pretty wary of the "sweetener" aspect.
The purpose of the franchise swaps is basically to help out people who get an unfavorable draft time, or who want to tackle a different challenge (i.e., have the #1 pick of franchises but wish to rebuild). It's not, however, intended to give franchises a leg up over one another by accumulating extra assets.