i really like this idea, how ever i feel their should be some rules. For instance if any one is wanting to post their car they should give full details about it and also mention what they are looking to exchange it with and their present demand.
For instance i have a
2003 surf ssrg
pear white
4 wheel drive model
demand is 3.4million
looking to exchange with 2000 model crusier or 2004 mark x
this way all members would know what to look at and save every one time