I guess the charity walks are being taken in for several reasons; I would think that after 6 months the revenue income would be near zero and the few walks that I have done suggest that they simply don’t last any longer. They seem to be either stolen/missing and a lot of the stamps are beyond repair (probably because of the number of people using them in such a short timespan).
I quite like BB’s idea of removing the geocache walk after a certain time – at least if you choose not to do the walk you rid the map of unfound caches 😉
