Split them up and you will sell them. Might not be what you want to do but as you are selling these attachment to them obviously isn't an issue. Very unlikely you will sell them as a lot for these prices, not that they are unfair prices. A lot of guys just want a few bits for their collection, not a complete amazing childhood set up like yours. This is the place to sell. Don't forget on eBay you have to pay and you have very few rights as a seller 