I disagree - it provides some insight. Plenty other models are selling *above* their retail price secondhand on ebay - e.g. the Dapol panniers, showing the demand for them. The 86s generally are not, even the limited edition blue one, which I've picked up for 30% below retail.
That combined with many retailers discounting heavily (CMC recently, Model rail direct recently) - I think that says a lot...
Cheers,
Alan