Trophies are dust gatherers and most of them are for not really doing much. The Junior MXers should get them (kids love a trophy) but I think they are a bit of a waste on adults.
We had the trophy cull of the century at my place. My missus is a former top 10 world BMX racer and her collection was totally out of control. There were easily a couple of hundred. When we moved into our new place, we pretty much filled a skip bin with them. The nieces & nephews got a few, and we kept the important ones like the state, nationals & worlds. We also kept some of the interesting ones, like the No.1 plates, handcarved ones and trophies with weather barometers built into them. Everything else got flung. The bloody things are still all over the place though..
My piss poor collection of kart racing, junior mx club titles, a couple of VIPER & VCM class trophies take pride of place in my dad's shed. I'm too ashamed to bring my crappy collection home to compete with the BMX bandit..