They don't appeal umpires' decisions because they haven't a leg to stand on
I thought this was a great article (it was reprinted in Saturday's Times which I read while eating a cheese scone in a Ballater cafe). In the British reprint it was accompanied by a cartoon of a Paralympic athlete with a prosthetic leg being told by a man in a white coat "Bad news, I'm afraid: you've tested positive for WD40" (which is a British brand of lubricant spray - the kind for the garage or shed rather than the bedroom).
Best bit? "I learnt why the Iranians are world leaders in sitting men's volleyball: because, it seems, there are enough polio victims in Iran to sustain a professional league structure. Pause for a minute and think about that."