why are they so expensive?

or more like: why are mach 3 (or similar) blades so much more expensive than the disposable triple blade ones you get? something like £8 for five.

I switched to using disposables and they were fine - a bit rougher on the skin but it wasn't the exercise in self-flaying* that i was expecting. £2.50 for four triple blade razors.

*hope this is a correct use of the word "flaying" now!