Wow, that is amazing, MikeBear!
I've been amazed myself, as I didn't want the hassle of dealing with Ebay. However, I'm 55 and have little time left to get my stash up where it needs to be.
The biggest "secret" for a little less hassle is to try to sell each thing or group for
over $100. For instance, if you have a "desirable" game cartridge as determined by Ebay's completed auctions, they go for bigger bucks. Maybe throw in a couple less desirable cartridges in that
same auction. It gives it a little higher worth, and might be better than a separate auction for every single item.
If somebody has already sold the same item, click on their auction, and there will be a "Have one to sell? Sell now" button right under the photos. If you click that button, it'll pre-fill out some of the stuff, and place your auction in the same category. That saves time.
GOOD photos, and GOOD auction titles is what grabs them to look at your auction in the first place. I have an older Olympus 4mp camera that takes BETTER photos than my sons 10mp Sony camera. If you don't do those right, figure out how to, or you won't make any money. Studying those "complete" auctions will really teach you what you need to do, and what sells.