generally, the answer is no.
Although i think there would be an impression amongst parents, especially, that quality tutors usually charge more for their services.
When it comes to tutoring in year 12 parents don't care too much about the financial cost any longer; so the large rates are not so much of a disincentive anywho..
getting back to your question - no. However you'd be forgiven for thinking that dear tutors aren't usually proficient.. as quality tutors would be stupid to charge pitiful amounts