Not is the train usually more expensive, the plane can do it all in a day meaning no need for an overnight hotel and getting back into your very own bed the same night. I think £100 ish for a return domestic flight is pretty good value.
Unfortunately people cannot see that a 189 seat jet six times a day at £9.99 simply won't work on NCL-SOU, EDI-MAN or ABZ-BHX.
flyBE play a vital role in the UK.