I looked at the ad's text on FGRV4sale and that is a very suspect way to sell a rig.
I will almost bet that the next thing that will happen is that the seller will start taking "Bids" for best price over his asking price from those on his list. His price is very low for a spring sale anyway. I think that the seller is just collecting names to hype or even shill the price up.
When we bought our Lil' Bigfoot
the seller collected several higher offers after we paid our deposit, but before we picked it up, and would have been happy if we backed out.
I personally avoid sellers like this. It's either for sale
now or fergetit.
And about "Fair Play".... When you drive over 350 miles (one way) to buy a rig, that the seller promised to hold for you for all of 8 hours, only to get it sold out from under you minutes before you arrive, you learn that all is fair in Love, War and Buying off C/L.