I paid top dollar to see The Police and The Eagles and both of them were worth it. I saw Garth Brooks a couple times in the 90's (the first time at a free concert), he is such an entertainer that he would totally be worth top dollar, but he always kept his concert prices pretty low, I think the second time I saw him when he was at the top of the charts it was only about $30.
Night Ranger is playing a free concert at the Rib Cook-Off in Sparks (Reno) this weekend, I'm tempted to fight the crowds and go check it out.
I'm not sure of any other bands I would pay top dollar to see anymore (I think I get cheaper with age!). I probably would pay top dollar to see Duran Duran again just because they were my first real concert back in 1984.