And as long as the price floor is intact it doesn't matter who is offering the swap, eventually the manipulator is going to add that contract to their position as well.  They might even intentionally be adding swap just to widen the net.

The idea of adding more swap is interesting, but if bitfinex offers swap on the last day, then everyone would pounce on it because if they can sell it then it becomes pure profit.  For this same reason anyone who offers swap past the last day of the contracts is an idiot.  They'll get the mining dividend, but they'll never see any real return from the contract.

I think the only way to make money off this would be to buy contracts, hold them for the mining dividend, and then sell them before it all hits the fan and the price floor drops.