Craigslist ad hoping to rip off rich, gullible nerds.
It is a collector's item. And even if you do get ripped off, the advantage of saying you own an invisible jet is your friends have no way of proving you wrong. Ask the guy for a receipt and you have documentation that you are the new owner of a legally purchased, if questionably existing, Wonder Woman jet. Our advice: PayPal the guy his $5k and ask your dumb questions later.
Sources: Pleated Jeans