Why is it so hard to buy parts from people

I’ve never seen where I have to pay anything to search. I guess I have no problem searching for stuff....there are dozens of different ways to look for items
They do not charge you to search. Their search deal is crap. They charge some to run an ad IF you want full exposure they call it. Does not cost much.
I'd say the little guy is not looking to buy right now. he wealthy guy has $$ to spend any time he wishes. But he looks elsewhere.
I'm 74 and wold like to get down to 2 cars I have 5 in various states of DONE> All us car guys love bargains. I could price them for 40 cents on the $ and get some sold. They can sit awhile!
98 (heat index 106) today, hard on us old timers.