I was about to write this floor probably cost in excess of 500 quid to be fitted.
The question I would ask is ....... if it was YOUR floor and it had been ruined by paint and it had cost you over 500 quid, do you think you would find someone to clean it AND seal and polish it for £65.00!!
Not a hope in hell.
Now it has been polished the floor most likely looks better than the day it was laid, it is also being protected against further wear.
It HAS to be worth £150.00 for your time, expertise, chemicals and machinery.
It is interesting to see the difference in thinking on price. The cleaners charging what they think is a good rate i.e £15 per hour and the carpet cleaners who see themselves as specialist and realise they are professionals at £50.00 per hour. It is all about perception and professionalism. If you charge £65 the customer will not value you and to be honest will think what an idiot whereas if you charge £150 he will know he has had a professional job well done.
Oh, and HAPPY BIRTHDAY John