I treat it just like any other purchase. I do the homework and feel out the seller and try to find someone that knows him or go on the forum and ask in the scammers section. You can tell when someone doesn't know what they are selling or is not really a racer. If I don't have a good feeling about the person after talking to them over the phone, I pass. I ask, what if this is bad, what are you going to do about it. I get a full name, address, phone numbers, emails. I check out the address to see it makes sense. I look at how long the seller has been a member, how many sales, his other ads, his personal info under member profile. Then you still are taking a chance anytime you buy online, so that's just part of doing this. You can use Paypal on Racing Junk, just like on Ebay. The seller just has to set up an account.
Racing Junk is not responsible for what you decide to do.
I have bought and sold over 100 items on this site, and have had a couple deals that were not quite right, but I just dealt with it and moved on.