I think you have to consider whether it is steady tutoring, such as every day/night or occasional. Also if it is individual or for a group.
$75 is really not that big when you consider that it is likely only paying for the time tutorinf=g and not reated prep and idle time.
A teacher or a Rebbi often has at least as musch schooling and expertise in the area they are tutoring as any other professional has related to their field.
It is unfair to say that teachers or rabbeim should be the first to drop fees. They are not very well paid in the first place and tutoring fees are very often the difference between covering a mortgage or not.