Despite me having stated on PPRuNe at keast twice before, I'll say it again.
With Stobart air, you could not get to Manchester for cheaper than €80 return with 7kg hand luggage only.
You can say it 100 times. You don't know much revenue EIR were collecting on this route. Taxes and charges play a part and these combined with fuel and staff and other costs are substantial. Unless you work in the airline you do not know how marginal or otherwise this route for EIR was. Irrespective of what fare EIR was collecting.