So this isn't really about the endless stream of 'sponsor this, sponsor that' - you know - 'my best friends neighbour is friends with a man who is going to jump in a river in New Zealand, can you sponsor him?'. That's a whole other thread
No the thing I don't get is why the 'task' that you get sponsored to do, is always so pointless.
Sponsored swim - who actually benefits from the swim? Nobody
Sponsored climb/run/walk - ditto
At DCs school: Sponsored 'bounce' on a jumpy castle, sponored silence, sponsored wee anything. JUST SPONSOR IT!
And especially Sponsored Jump out of a plane 
I get it when it's en masse - the London Marathon.
But when it's a few people, why doesn't the task relate to the fundraising? Why not:
'sponsored bake and give the cake to the local soup kitchen?'
'sponsored build a new school in Africa instead of 'climbing the mountain' seeing as you're over there to raise funds to build the school'
'Sponsored decorate the library' (seeing as you are raising funds to decorate the library in the first place)
And so on and so forth.
This is quite a lazy AIMU. I haven't really thought it through, but I have always been vaguely
about the pointlessness of the tasks, no matter how good the cause.