It is a lovely area isn't it. I have happy memories of mountain flying courses there. There have been a few hele schools there over the years. One or two got reasonably busy. But in the end they seemed to fold. I guess redeye is right about the fairly limited number of people in the catchment area.
However, there are examples of schools prospering in similar areas. The one that springs to my mind is Tiger Helicopters at Shobdon - been there for years and has incrementally grown into a thriving helicopter company with all the bells and whistles (and no I have no connection other than passing through occasionally). Probably the difference is just whether the person who runs it is a good businessman or not, plus a bit of luck.