Buying and PPI could be a lost deal

Found on AutoTrader a private seller what looked to be a very good deal - Honda CR-V EX-L for $9800 with 92k miles and I think it was a 2015 ( may be off a bit on details). Next day it was gone. It lasted one day on the site. So, if I was interested and checked it out and said I'd buy it after the PPI I would lose out on the deal. There was another car a few weeks ago, the seller was out of town but when they returned it was sold within a few days. I have a feeling those buyers are not getting a PPI or they could be bringing someone with them who is a mechanic.