It's a common interest thing mainly, and as has been said it happens in other single interest spheres. As has also been said or alluded to, it also has it's squabbles, friendships, alliances, cadres, and what have you, so in that respect it's very like a family.
It's only when it gets nasty and personal, which it does sometimes, that the bond is deeply stressed.
I never went to bed with an ugly woman, but I've woken up with a few, and I never met a Mudcatter that I didn't like.
I've had some wonderful support, lot's of free accommodation, and more than a few hangovers thanks to Mudcatters I have met. Very enjoyable ;)

Here's tae us, wha's like us? Damn few, and they're a' deid!

Giok