Sponsorship requests

I seem to have been asked quite a lot to sponsor somebody for doing something which I kind of feel they want to do anyway, for example, bungee jump/cycling to Paris etc. I absolutely appreciate that any money raised for a good concern is amazing - but am I also paying for them to do something they ought to fund themselves if they want to do it? I was also recently asked to sponsor somebody to sit in a bath of cold baked beans!! I’m sorry, but surely they could do something more useful ..... I would sponsor really good money for somebody to pick up litter or clean up graffiti- but maybe that’s no fun for them. Am I just an old killjoy or what do other gransnetters think?