I suspect that financing could play a role here.
At a couple of thou most folks can find ready cash but when yo get close to $10,000 (well OK, over $5000) most need to finance, so your market gets much slimmer.
Once won a govt auction at $3000. for a seized current year Subaru that (at the time) should have retailed at $15,000 used.
I had to wholesale it for around $6 even tho I has asked only about $9.5. retail.
It had warrantee left, so there were no service issues and it was super clean with a mere 5,000 miles or so.
At auction it could not start due to blown fuse link in starter circuit and as a joke I placed my 'garbage bid' fully knowing of the factory warrantee would cover any major repairs.
After much pondering (and Q's from 'lookers') I realized that no bank would finance unless via a dealer and at that time and place the amount of ready cash was outside of most folks capabilities.