The current EBAY pricing is an auction price for early adapters who... "just gotta have it" and sold to the highest bidder to fund development so Majsta insn't killing himself.
The Vampire 500 is supposed to be at least $250 euro range, or a bit higher... but not $500 - 600. The previous pricing ($150) was at or below cost and not really manageable long term.
The team doesn't want to price gouge.