Perhaps your just slow Squealer!!!
Anyway I don't charge the same as you as I only charge £1 for an average sized window 3' x 3', any bigger than that and I charge accordingly ie double that size then double the price £2 ect ect, and a patio door is deffinatly at least £2.
Anyway thats enough of this pointless arguement I'm off to work, the sun is shining and I have got a £120 customer waiting for me, that should take me until at least 11 am
Have a good day Squealer!!!!