Plastic collectors are a different breed and different things appeal to them vs metal collectors.
There are some extremely rare Marx character figures from their playsets produced in the 1950's and 1960's, I recently sold two character figures for 60.00 each on Ebay; they are plastic, unpainted figures, but two buyers felt they were worth that price.
Some rare Marx playsets have sold over the years for incredible money, same with Barszo playsets. For example, his Aztec playset sells for upwards of 1,000.00.
The person who purchased this figure is an avid Britain Deetail collector and purchased an extremely rare figure.
As long as he's happy with the item, in the end that's all that matters.
Back in the day, a super rare K & C glossy set of German tankers sold all day long for 2,000.00, that's 500.00 a figure; how is that any different than this.
Live and let live.