It is a Hobby so when I want to get rid of stuff it is mostly not on ebay but on other fora, mostly trading into other stuff on specialized fora (like Amiga stuff on A1K.org). Also sell some fancy new stuff (like Pentium's) I never will use again.
As PeterLI said, when you buy at ebay and sell on ebay, you can almost make no money at all. Making money is only possible when you get the hard- and software from other sources and sell on ebay. Or buy as defect, repair and sell on. I did that some years ago (2005-2007) whit iMac's G5, that was quite profitable, mostly replace some leaking Caps and they were working again.
And I don't like ebay, even to buy stuff I mostly use other sites.
And for selling, putting stuff on the internet cast a lot of time. For example, you have some "classic" games, you could make a bundle but than you won't get the money that you could receive selling each game apart. So you make some pictures of each game, write some text, put that on the internet. Next IF someone buys it for the money you want,you have to pack and post it. So the effort is not there, you "work" about an hour to receive 5 or 10 bugs. I could do some pressures things whit that time, like playing simcity or the settlers.