I'll put money it doesnt last 365 days I know this because my gf sisters both own beauty places and one of em had it done yes it's semi permanent but No way is it 365 days worth IF it was why doesn't everyone do it?
Also your maths sucks, unless GHD's blow up after 12 months then you are still financially worse off. since your already $100 behind the second treatment and your $450 behind.. But meh you hair just don't kid yourself it will be perfect in 12 months with your chemicals.
You say well played cos your sooky we think your gay for straightening your hair.
And time is not money when it's off the clock and I gather you are a waged maximum hour week thus your time is not money.