Wow, i really need to get more purses so that I can switch more often! I'm just starting to build y collections and I still buy bags that I just don't love after I get them home and have used them a while. I usually switch each season 2-3 months.
I switch pretty often. I always have to "match" my bags with what I am wearing. For me, its just like putting on jewelry and shoes. I do however, have a couple of "in the moment" favorites that I switch from. If I had to dig into my closet and find the bag (where all my others are stored) I would get too lazy to switch and do it. So I keep the few I like right now in my room for easy access. I usually just toss my wallet, makeup bag, cell phone and keys from one bag to the next.