The Supercar Registry - Motion Performance Pricing

So, I have attached pictures and in my mind (at least) an estimated value. Am I too high? Low? Just right? There has never been anything like this available for sale. How do you put a value on something that's never been available? You get a Motion Performance Distributor Door Sticker, Motion Supercar Club Bumper Sticker, Supercar Club patch, Supercar Club side window sticker, 1 sheet Motion Performance Letterhead (with Joels signature stamp), 3 Motion Stickers. 2 from the 60's and a signed one "Mr. Motion" from 2005 and early joel Rosen MP Business card. Also a post card of Joels Cobra at the track. Will stamp everything with his signature stamp and will substitute a Supercar Club Letterhead in lieu of the MP letterhead if you wanted. $1500 for the lot. Also have Joel's Supercar Club Keychain for a grand (firm) Will provide COA with the lot. Comments?