Hi,
I could be wrong, but I think there are two main angles to this (ok maybe a third)
1) People are likely to sponsor people they know, due to friendship/family ties etc. (it’s unlikely he’s score highly on this one with STW audience)
2) People are more likely to sponsor people if they think it’s a really good cause. But you’ll have to make a good case.
3) Some people might be motivated to sponsor him if what he’s doing is especially difficult or challenging (in their opinion). You could give us more detail on what he’s up to, but the response from readers may not be that huge.
HTH