Barter for Services?

You think I can barter for a discount on someone's services. With photography, it is always about the latest gear, the newest body coupled with the best lens. Since lenses don't get updated that often, offering a photographer a lens to borrow doesn't really interest them. But if I could offer them a new body that they might not be able to afford, maybe they will entertain me? Say I was going to get the new 5D Mark II and offered to someone who only had the first 5D or even someone shooting with a 40D (I would never hire them). Maybe use it for a couple of months or a few months and give me 500-1K off?!?!?! Sounds like a plan. If you don't know what the new 5D is couple of check out this video by Vincent LaForet.