I've been seeing this claim pop up quite a bit lately. It is certainly not my experience, not in the least.
With Trac II the first couple of shaves were fast, but over aggressive, imagine doing multiple WTG passes with a new feather, leaving the face raw.
With budget DE blades, Astra, or Shark for example, I get five or six great shaves. I've stretched that to about 15 shaves, but as Blades cost around 10 cents a piece, why bother? .
Have you tried any cartridge razor newer than 30 years old?
Ten cents per blade!
Like this?
http://cdn.calisphere.org/data/20775/88/bb06153188/files/bb06153188-ark-20775-bb06153188-1-3.jpg