Ebay sellers can be very,very annoying. They will part out systems that shouldn't be parted out. For example, a seller had a matched pair of Heathkit tube amps and sold them in two different auctions. You won't catch me bidding on them because I may not win one of them and unless there are two, one is useless to me. I suppose it's good if you only have one and want another- but
most of the time amplifier
pairs are sold separately!

The people who have ultra rare amps will sell them together and ask stratospheric prices, but the ones with reasonably priced amps always mess it up.

If you have only one to sell, that''s fine- but I really believe it is ultra-unwise to split matched pairs.