Honestly Kinga, and with RESPECT, I don't know what you're trying to accomplish.
Milupa's an experienced and well respected client.
The first thing I learned in business years ago, is that when somebody says it's NOT about the money... well... it IS
We all expect to be paid for the work we do. It's how we APPROACH the subject of money with our clients that's important.
I can tell you that $250 for an hour at an MP is almost at the top of the rate scale.
A 1 hour BS at SRM would be $240
http://www.royalspa.ca/rates.php
A 1 hour BS at HFH would be $260
http://www.handsfromheaven.ca/prices.html
For your spa to only offer 30 or 60 minutes is just plain stupid. While that may not be YOUR fault, I can guarantee as an MPA you'll run into this problem again.
As a client if I booked 30 minutes and we went to 40 minutes, I'd expect to be charged an extra $20 for the room, and maybe an extra $20 or $30 in tips.
Here are some POLITE suggestions:
1.) As an MPA, don't bother reading massageplanet.net. You'll only get frustrated and/or paranoid. Most of the top girls out there can't be bothered because they don't want to spend their lives at the MP then come home and "defend themselves."
2.) Suggest that your spa establish some fixed 45 minute pricing. That way if a client "goes over 30 minutes by even a minute", you can ask for extra cash without the client feeling gouged.
Take care