There's a world of difference between Easyjet operating an A320 and Loganair flying an ATR42. Loganair were probably paying the same, if not more in fees for their ATR than Easyjet is, while Easyjet divide that cost between 160 pax, Loganair at most could divide it by 50 people. There are also a lot of people on that plane who probably paid a lot less and got the starting fares at £29 one way or whatever Easyjet start at, which wouldn't be so possible on Loganair's smaller plane.