Well, I am definitely doing that. My friends have bought over $100 of merchandise so far. I won't go overboard like that, but I've picked up items to remember this trip and a few knick knacks for my coworkers when I get back.
Sigh. My roommate tends to go crazy in gift shops and her fiance is visiting from Australia. He might not make it to DC again so he's buying all the mementos he needs now, I guess.