400/426 Stroker. Ever heard of one?

So what was the original reasoning behind offset grinding a factory crank? Do you have a buddy with a crank grinder? Offset grinding used to be the only way to build Mopar strokers but we stopped doing it roughly 20 years ago because it was more expensive than just buying a new crank. There used to be local guys with crank grinders who knew how to grind cranks to spec as well as do things like offset grinding, but they are all gone now. I haven't seen an offset ground crank in years and we wouldn't even bother to quote a job on one these days.
Also--I use a crank shop near me in Quebec for my balancing needs and from time to time I get them to grind or in some cases index/offset grind certain cranks (He is so much better than me at it) and for what he charges to offset grind isn't a quarter of the cost of a good new crank. I'm not talking a Bryant or Winberg either. J.Rob