When my late husband first got sick and had to stop working, I used to sell a lot of books on eBay. I averaged $300 to $400 a month just on homeschool, children's and Amazon books. That's not enough to pay all the bills, but at that time it really helped us out a lot.
It kept us afloat financially. Even though he immediately qualified for Social Security (terminal cancer), the amount they sent for the interim, until full SS kicked in, was so small we couldn't have made it without some other income.
I'm hoping to be able to get back into book selling, but this time I won't be keeping so many on hand. When I moved into this house, I had enough books in storage to half fill a pretty large unit. They weren't easily accessible to me in that unit and there were way too many of them. So, my plan is to select only the best volumes and list them right away, not getting any other books until those are sold.
In the meantime, I need boxes!!!