It definitely is a lot of work, but if it's working then I can't argue with that. I do have a few questions about your business though...
1. There are a lot of other book sellers on Amazon, eBay, and Other online platforms. What is setting you apart from them & making your business work? Is it just simply that you are getting your inventory for cheap?
2. Since it sounds like a fairly laid back business with just personal sales and whatnot I would be concerned about Buying and selling books that have been stolen. Do you keep records of who sells you what book(s) and write down drivers license number and other information?
3. What about when a new edition of a textbook releases, I know i have seen book(s) drop 80%-90% in value as soon as a new edition comes out. Is there any way that you look-up if a new edition will be released soon? Or do you just take a chance with it?
4. When do you sell books that you buy back at the end of the spring semester? Do you hold them for the summer, or is there enough demand to sell them online throughout the summer for summer semester?
nmills, I would like to hear more, and even have some ideas on how to increase you inventory and possible gear things up a bit for this coming book buy-back session. PM me if you want to talk more about this