yeah, aside from a couple of brief jumps into guitar gear and a/v revamping, anime has been my primary hobby for the past 2-3 years or so (i usually phase through hobbies in 6-12 month increments).
about 40% of what i have for sale are series that I really liked and decided to replace what i had with my favorite version of the set. e.g. gunslinger girl, akira, cowboy bebop the movie, and full metal panic i replaced with bluray, speed grapher and genshiken i replaced with the limited/premium edition art box sets, etc.
the remaining 60% are split between stuff i watched once and didn't like (or didn't even finish), or sets that i watched once or twice but felt no desire to ever watch them again (or if i do want to watch them again i'll just buy them again in the future).
it's taking me a lot longer to unload these than i had hoped though.