Muttley, you limit yourself in the sense that you must mostly ignore cross country races and club series runs.
The type of races that are low key, low entry fee, and minimalistic.
For instance I do xc series races that cost £2 in the winter. No medals, water stations or any unnecessary guff given out at the end. Just as satisfying as any of your razzmatazz races.
You also miss out on well known races like the Marlow half, just because no medal. Seems an odd limiting factor!
From my experience, you're also lucky that you haven't yet done a race that promised a medal, only to receive a "memento".
Unless you check with each and every race organiser....
wait a min...
you don't do you? 
Edited: 16/11/2012 at 20:27