funny I do that but say once a month instead of fortnightly 
then they accept and still want me fortnightly 
I really find Scottish people strange.
so do I
they are mental, I keep telling them I can't do fortnightly but they keep asking, some are on the phone asking when I coming after a week and a half
although to be fair it is a minority and I can see where you are coming from on your thinking
and I agree, but if they want to pay for it, I will do it but I don't charge any less for the privillage of having me round more often