Yep.
I buy as manny boxes of hard cover books at auctions for 1 o2 dollars. Sometimes I will go a little higher but that depends on what has attracted me. I then get an estimate on a web site I use for old books. I keep all pertaining to Canadian history plus others I want to read. Then I place on e-bay any book that values over $100.00   I do O.K. and sometimes not. First book I sold on E-Bay I got $167.00 American. Paid a dollar for the box. Worst deal I sold an Agatha Christie for $50.00. It was worth around 3 to 4 thousand. Felt bad but then I again only paid a dollar bor the box.
Those books I have remaining I have one garage sale per year and what doesn't sell there I give to the local church garage sale. This way I don't throw any away. I have presently over 500 that will be picked up this weekend and sent to some organization that is looking for books.