It isn't uncommon unfortunately. People are selling cracks of many different programs on EBay. Some go to the trouble to actually print a CD label that looks like the real deal and claim they "lost" the manual. But when you see the same person selling the same program week after week and all the auctions start at "$1" or "$5", well...it doesn't take a genius to figure out it's a crack. Especially when the program starts at $600
If it get's reported to EBay, sometimes they will take action, other times not.
The sad part is, there are some people nieve enough, they believe they are getting a "steal" (no pun intended) on it. The ones who are more knowlegable about cracks will just get it for free on some warez site.