Yikes! Makes me glad I mostly like rather obscure musicians! The most I've ever spent for a concert was $35 for a solo concert by Anthony Kearns (of the Irish Tenors)!
We don't hit a lot of the concerts either. Off the top of my head I can't think of anyone we'd have to see if they came to town. A few years back I took the Mrs. to hear Itzak Perlman for Mother's Day. I was appalled that the theater wasn't packed.