If you think there is a market for it, go for it! Just research before you jump into it. eBay buyers are fickle, even Amiga buyers.
I have done some research on uk ebay 040 cards for an a1200 fetch around £70 plus postage and 060,s fetch around £170 every 060 i have seen has sold for that much, also ppc cards fetch £170 i could have had one from amibench for a £110. A500 hard drives fetch about 40 pound and a phillips cm8833 mk2 monitor sold for 50 odd pound including postage i have one of these that i paid $8 pound for because it was cheaper than a scandoubler takes more space though .
I am only thinking of the things which alwayas seem to make money cdtv,s seem vary a lot one week 3 made good money at the moment they are making next to nothing.
At the moment i have to sell some of my amiga collection due to to many machines my second pc the msi motherboard died so that will give me room for two ppc amigas towers when i get the second built one pc is enough. :-)