(Lack of) Moderation in Concert-Going

[GarboSpeaks!]

I follow Stevie & Fleetwood Mac. Siouxsie when I can, then there is a local act that I like a lot that I see several times in a year, but that's cause he's local and tix are generally pretty inexpensive.
I LOVE concert going, and if it's my favorite bands, it's worth every penny. Even though I am dismayed @ the lack of change in shows (FM/Stevie) I still love every second if it. BUT, when I see Siouxsie multiple nights and she changes it up a bit or a lot, I'm like why the f can't other acts do the same? lol
Theatre I dig too, but haven't been able to see as much as I'd like (prolly cause I'm following the Mac around. haha....) Last show I really liked was Hedwig. I sure would like to see Wicked though. I hear it's coming to SF.