Interesting thread and great replies! Here are my answers:
How often do you change bags, and how long does it take you to decide on one? Not often, and doesn't take me long to decide. Depends what is going on that day.
Do you ever regret your decision later in the day? Rarely. Only when I have one too small for SO to add extra stuff
Do you ever pick out your outfit around the bag you want to use? Yes! Most of the time. i'm glad I'm not the only one.
Do you accessorize with different straps and charms? Not yet. Don't own any bags that fit that bill.
How often do you go thru your collection? Not often. I have some classics that I love and would probably never sell, but hardly ever wear
How often do you feel the itch to get a new bag? CONSTANTLY!!! I'm more selective now, but always on the hunt
Do you notice others bags and does it influence what you wear or buy? I always notice others' bags, but I rarely get influenced by others now. I buy what I like regardless of what other people like or what is trendy/popular