To maximize their earnings of course. Hopefully, they have made it a ticket or private show on the other platforms so they don't run afoul of SC's TOS, otherwise it is allowed and a fairly common practice. The only thing you should ask yourself is, does she give you her full undivided attention. If the answer to that is "Yes" then you can 1) learn to deal with it, 2) talk to her (respectfully) about it, or 3) find a different model. But, if you are getting her full attention then you are getting what you paid for.