It's very common. For many people a peer to peer ask is the most effective. However, if you'd rather have the conversation with a member of the Development Office staff instead, just politely say so. They should be more than happy to oblige.

Is it common for area independent schools to have parents reach out to other parents for fundraising campaigns -- in this case, large donations in excess of $50k -- or does your head of school or development office do the ask? I'm somewhat uncomfortable discussing ability to give with other parents.