I keep telling myself that I'm going to flip all the frames I don't need as soon as I move to a city with a better market. Until then, I'm hoarding. Of course, if you're already in a good market, I'd recommend either parting out or reselling frames that don't fit you.
...speaking of, there's been an RB2 advertised in the local paper here for about three weeks now, priced at $200 that I'm really tempted to pick up, even though 56cm is too big for me. I'm constraining myself by constantly thinking about having more stuff to pack up and transport when I move.