Well, we were all newbies once, and I don't know what everyones reason for joining was. Some of us probably wanted to buy or sell cars. I think if they are interested, they will stay, and if not, well then they won't. A lot of people just like to read without posting or making any comments. I just sat around and read posts for quite a while before getting more involved, and I'm sure there are many others that acted in the same way. Also, some people may just be getting out from underneath a car, and no longer have a reason to stick around once the car is gone. I don't see any problem with that either.
As far as selling their cars, I think that they would get less here, than from the general public, because we know more about them and what it will take to fix or restore them.