Ive had that happen before aswell.
But the opposite....i was the buyer and drove over 100 miles to meet.once there guy tried to up the agreed price.
It was seller idea to meet halfway,and wanted me compensate for his time.
Its one of the reason i avoid buy/sell/trade ads.
And dont get me started on facebook marketplace moron
Example
Sold my wives old suv,114k miles with a bad transmission.wouldnt believe all the messages asking how much,whats wrong with it,is it reliable cuz im a single mother with 3 kids ect.can you deliver to a town 4 hours away,would you consuder $200
Tittle of ad clearly stated needs transmission,and price.
I call those picture shoppers,they dont read,just see something pretty and instantly offer way less before asking whats wrong.
I was asking 1000,had a guy talk me down to 500.i was tired of answering messages and agreeded to 500.guy drove here and was mad at me and didnt want it cuz i never told him trans was going out.do you think youll buy a nice 114k mile car that has nothing wrong with it for 500.this aint the 80s lol.