Re:
'Cheap' relative to what.
Value is determined by supply and demand. If all the other ones available for sale out there (the ones used as comparables) happen to be largely over-priced, then pricing yours a little below the others, but in that case still substantially above a reasonable market value point, will mean the item will not sell.
That said, i have no idea what a realistic market value or price expectation for said items may be ... just sayin', about the economics/science of it all. For all I know, you may be right in the ball park and it being just a matter of the right buyer coming along ...