Seems to me that not renting your own warehouse, and not paying to move 500 bikes and not having to prefigure a price on an unknown sale are distinct advantages, and would allow you to sell the bicycles with an almost zero risk factor on your part.
I like the test balloon idea. ALso, I guess 500 bikes at one time would be a significant flooding of the market, and you might want to spread this out over some time.
I have been watching the guitar selling on EBay, and have been amazed at the number of absolutely cheap imports which seem to go for the shipping and handling costs plus a couple of dollars. But the shipping and handling generally run about $35-$40, which it seems to me is how they make their profits. I am sure the actual product is pretty much junk. Even the "
Buy it Now" feature is only $1.99.
So, what about shipping and "handling?"
Good luck.