Where I am, there is no way in h**l you could do that, lol. They have a very (VERY!!) strict outline of numerous things you have todo, just to get into a preparation class. And just from all the info stuff I have learned from the diabetes team, I think it would be illegal to sell your pump to someone.
If you did manage to sell it, it would probably be very useless to the buyer. Because the buyer needs more than just the actual pump. The buyer would need refils on the insulin, refils on the inserter device, refils on everything-basically. And they can't get refills without the Dr's approval, and the insurance company would immediatly deny it since it is technically not legally yours.
So I think you could-though its probably illegal- but really it would be as good as nothing to any buyer. But i doubt anyone would buy it lol XD