That is impressive!
I get a bit like that with razor blades, I use them until they really are blunt,,,it gets a wee bit tender but I hate having to fork out the price for new blades!
This is about to change soon though, Ive just got myself a Costco trade account so I can get a year worth of razor blades for about £30 which works out a lot cheaper than getting them from Tesco and the likes
O.