Do you/Did you sell back textbooks in your major?

[kateee]

When I came to college, I told myself I wanted to keep textbooks in my major for future reference and because I love my major so much they will be fun to read. However, these are also the more expensive books, and worth more to sell back. This semester, if I sell back all my books I will get a little under $50. My Child Development book alone is worth $88 dollars if I sell on amazon. I need the cash but I will be working full time. I can't decide if I should keep these text books or not, especially seeing as psychology is one of those subjects where these texts are getting updated and revised almost yearly with new information. What do you think? Did you keep text books in your major, and was it worth it? Or should I sell it back?