I have to disagree, what you are both suggesting is that in extreme weather (when lost dibbers are likely to occur) the race organiser should agree to cover the cost of lost dibbers. In practice this would result in one of two things (or both). Firstly, race entry fees would increase dramatically (who would organise a race that not only takes a lot of hard work and time, but could leave you hugely out of pocket). Secondly, any poor weather or conditions would result in cancelled races by organisers not willing to risk said expense. Remember, they would have to assume that a large proportion of dibbers would get lost, just in case that happened.
Yes, paying £30 is annoying, and it would piss me off too. But, it's in the rules, it was lent out for the race, and if someone lost it then they have to pay for it. Simples.
A friend of mine lost a pair of x talons at a race last year (someone lifted them from outside the school hall the race hq was in) so her race cost her £70 or whatever more than everyone else, these things happen.