I had the same thing happen in the last couple months

Sold a snow plow Aug 17th for $162.50 and the person never paid or picked it up
7 ' Foot Meyer Snow Plow Blade Electric Over Hydraulic Complete Was on Blazer | eBay


Sold it again on Sept 7th for $162.50 and the person never paid or picked it up
7 ' Foot Meyer Snow Plow Blade Electric Over Hydraulic Complete Was on Blazer | eBay


Sold it again on Oct 12th for $670.00 and the person paid and picked it up 2 days later
7 ' Foot Meyer Snow Plow Blade Electric Over Hydraulic Complete Was on Blazer | eBay

Best I can figure is supply and demand and getting 2 people in the same crowd that want the same item