Never bothered because eBay isn't the way to sell a large collection,in my mind, although it would work to generate interest to deal on the side. I've been at this for decades, so I know the value of say my entire ADAM collection and I wouldn't be very flexible if ever I decide to sell.
Show us your Coleco Adam collection
As time goes on, the number of people with the knowledge or interest to run these legacy systems will be declining, and I wonder what the market will be for them say a decade from now. My guess is that prices will drop sharply because the demand will simply not be there while the supply will increase as older people move on. Your collection is impressive to say the least, but it's not for the faint of heart and can easily overwhelm the uninitiated.