I'm curios about the amount of TBers that view their playing as more of a service they provide or more of an art.
It's a great question.
Taking it out of music for a second. Was Michelangelo providing a service or art? I think there is no question he was both.
He was also an employer - said to have had dozens working - he didn't carry the buckets of paint up the scaffolding to the Sistine Chapel himself, and I doubt he built the scaffolding himself, someone else even mixed his paints. He was commissioned by Pope Julius to paint it - so he had a 'boss', and couldn't just paint lusty women up there. He was a businessman, after all.
The answer is definitely you
can be both. Even the great artists understand that they want their work to sell, they need buyers. Of course, whether it is art or not depends on intangibles such as artistic self-expression, universal message, uniqueness, aesthetic qualities, etc. But it's always a business.
True, some genre's of music are more 'cover' oriented, but that doesn't necessarily always mean that there's not a unique interpretation that goes with it.
The thing is, in every profession there are folks who eventually have to ask themselves if they are "order-takers" or "leaders" in the business relationship. I actually feel musicians are doing folks a great service by telling them that what they are requesting is something that they just don't do.
In the same vein, you can either "do gigs" that people request, or you can "create unique performances." The latter can be both servicing and artistic, IMO.