if you can sell them for 75$-90$ on ebay to people who want it... I don't think that you are going to get someone to... I dont know... If you sell one on ebay, seeing that you 'sold a bunch of them' already, then you are not paying $100 for a repro, you are trading various vendors.
I love it when people say "I just sold this for $1200!!" and then 3 seconds later say, "Here is another one for $600, its a nice investment!!". Sounds a little shady if you were to ask me...