they are.
IMHO the reason people aren't beating a path to your door:
You don't know if it works (stating it makes you appear unwilling to find out)
You won't separate the winch from the bumper (difficult shipping, may not want bumper)
It's $500 for a possible boat anchor.
If it were me (and it's not, just offering friendly advice), I'd hook it up to a battery, and let folks know if it works, and separate the bumper from the winch and offer each at separate reasonable prices based on functionality and be willing to ship.