At my club we have a member who test flown a couple of their planes for the company and he told me the prices fluctuate becasue of their status of backlogged orders. If VF recieves a lot of orders and the list becomes too great they raise their prices higher to distract people from ordering. Once VF catches up with the backlogg of planes they lower the prices back to normal. If you wanted to buy the plane at the higher price they will take it but, you may wait a little longer for your order.
I think good things happen to people who wait. VF has an ARF that is of surpreme quality and id wait a little longer when i know im getting a quality product. When i ordered my edge 540 from them, it was right before Christmas so they were allready getting filled with orders. But i recieved my plane in about 2 1/2 weeks. Once i placed the order VF emailed me a couple days later saying my plane is being built as he was writing the email. I think that is awsome.