I don't really know. It seems that prices are getting soft on the standard F1 Launch Brochure. I paid $280-something for my copy. One sold yesterday for slightly less then that. They've been at or over $500 for quite a long time before that.
The GT brochure is a different animal of course, but I just can't guarantee the bids will get as high as you suspect. I'd like it to though, as that would mean my copy is worth quite a bit more than I paid for it.
>8^)
ER