Well, that's not really a random sample, is it? I mean, if you go through the trouble of signing up with the ladder, buying the logger devices and so on, you're already in the moderate-to-high endurance bracket, I'd say. Or are you really saying that the whole glider community in the UK only managed 4698 flights, altogether, over the whole of 2010?
I don't have the means to analyse all flights by all pilots - but the ladder does represent some of the flights of 632 pilots - which are, I suggest, a few more than
well, every sport has these endurance types but they form a very small minority
The point I really wanted to make is that a significant number of glider pilots regularly fly long distances taking several hours on most of the days when the conditions are suitable - and that many of them are longer in distance and duration than is generally realised outside gliding communities. The 2000 km + flights that started this thread are still fine achievements.