I get the point, but live performances by musicians are a pretty weak example. A performer can only do one performance at a time like a masseuse, but unlike a

I get the point, but live performances by musicians are a pretty weak example. A performer can only do one performance at a time like a masseuse, but unlike a masseuse, a performer can service a very scalable number of people simultaneously. i.e., a performance musician is merely selling concert tickets rather than CDs. Tickets are less scalable than CDs, but can be sold with a much higher profit and don't need to be as scalable.