So many people I know want sponsorship for walking in the Highlands/jumping out a plane/walking through town overnight in their bra.
I remember sponsored walks used to the domain of kids raising money for scouts and the local hospice, but now we are expected to cough up for loads of, what seems to me, other peoples' fun.
I give to charities already, both with time and money and I haven't got spare tenners to chuck around. I feel guilted into coughing up, but when I do, my own kids miss out.