Going on 14 years now as a pipe smoker, and over that time I've owned about 80 pipes, and the most at one time was about 50. Which was way to many for me. The last few years I've culled the collection. Some I got rid of because I just didn't smoke them, or they were bad smokers for me. Others I got rid of to allow me to purchase a different pipe.
Currently I have 34 pipes, 20 meers, 11 briars, 3 cobs in my collection. I'm pretty comfortable with my collection at the moment. I'm sure at some point I'll either get rid of a pipe or two that doesn't get picked up to often or just add a new pipe if something catches my eye, but at the moment I'm not looking.