I have a few "masters degrees" worth of books... physics, math, origami, Japanese, art/design, photography. I've had to force myself to slow drastically buying in favor of reading the ones I already have. Also, I'm running out of space.
Same here. Every time someone checks out my bookshelf I tell them that I only read a few select pages from most of those books during my studies and that's it. No regrets, too!