Anyone have success selling used printer / copier fuser assembly or imaging drums?

Does anyone have any experience selling used fuser assembly units or imaging drum units from printers and copiers? I just started to collect the fusers to sell and some do sell pretty good. I have not yet sold to one of the national buyers yet, but sold through ebay a few times. I have noticed some people have sold used fuser assembly units (needing to be refurbished) on ebay for upwards of $50.00 - $100 each. I didn't quite have that kind of success, but more like a lot of 3 for $20 to $25 plus shipping costs. Does anyone have anything insightful as far as selling these successfully. I currently have a huge one in my garage that is nearly 2 feet long from a large copier. I have about 20 more of these things and would like to find out any good success stories on selling. I get many of these and would like to know of any good advice. Has anyone used any of the national buyers like MetroFusers, LaserPros or RecycleCores? If so, what was your experience going through the buyers?