Hipennine,
Yes I take your point - SOU & BOH are complimentary in certain ways. I keep on thinking of other comparisons - BHD (also restricted) & BFS - but neither has 'bottomed out' - so maybe GLA & PIK? Perhaps PIK makes up for its distance from city centre by having a rail link with two trains an hour instead of 2 each week!
But seriously, I refer you back to FR. MOL has repeatedly said that the airport charges are the biggest driver of where they fly - more so than whether or not there is any latent demand between the two points (that is from the horse's mouth!).
So are Peel not as desparate as Infrail? Not yet? Or better to have x pax paying full handling fee and development charge than 2x pax paying pennies?
How big are the car parks @ MME?