Of so, then why does a $170 price exist?.
There are some girls that have $170 as their price but since I haven't seen anyone with that rate, I don't know if reception will accept that rate?.
Of course for the girls who have a listed rate of $170 reception would accept that rate. That's the point of posting the price range on their profile page.
For the girls that start at $170 that's all you would ever pay to the manager.
Any desired upgrades beyond that would be paid in the room, and if you don't want any extras then $170 at the front desk is all you are obligated to pay.