Rita, if the only issues were with people not following the instructions, I'd agree with you. However, I saw cameron's D-Tag at Al's Run. It was attached to his shoe according to the instructions. Also, it seems as though an official admitted to wsuraiderwi that the instructions were incomplete. Finally, with the common theme of problems with water, how is this possibly a good idea for road races where it might rain?
If the only problems were with people who didn't follow the instructions, I'd say people need to learn how to read. However, all indications are that the problems go well beyond that.
As for the cost factor, why does the cost factor of the D-Tag get passed on to the runner but not the cost factor of any other timing system used? It seems like the D-Tag is either overpriced or race directors are just finding a way to extract more money out of runners.