I guess I do very little true "impulse" buying - I bought a ton of books during the Fictionwise sale (well, it would have been a ton if they were paper
) but the purchases were well planned out and I definitely don't regret them. Almost all were either filling in series that I enjoy and know I will read (eventually) or replacing pbooks that were keepers because they're potential rereads. Now that I've found good homes for those pbooks I actually have a little bit of space available on my bookshelves for the first time in years!