I teach in a district with many wealthy families.
Some of the teachers at my school drive very nice cars. They are all married to someone who makes alot more than we do.
Some parents would hire a tutor whether their child needs it or not. They feel like if they don't, they're not doing everything they can.
I don't think tutors are particularly helpful, for several reasons.
In my experience the main benefit of a tutor is that it compels students who tend to blow off/copy assignments to sit and focus on math for at least an hour a week.
I prefer my students not get tutored because they sometimes cop an attitude in class like they don't have to pay attention, because the tutor will teach it to them later. (This is not very many students...just an obnoxious, overprivileged few.) Overall it sends a message that parents don't trust teachers to get the job done.
All that being said, most of my students don't have tutors. They participate in learning activities and complete the work I ask them to, and we get good results.
(Back in a bit - I promised myself I would do "first things first" this morning. Sure, I've already broken that promise, but that's why God invented the mid-course correction.)