Derry Airport is a shambles. I couldn't agree more. FR screwing the place and holding it to ransom being the biggest issue. More recently, the supposed flights to DUB and IOM have not actually appeared anywhere for booking.
However, unless you live in the Derry and Strabane District area GAZMO (I'm sure you'd have "noticed" if you did), then it's not costing you anything. I could list a whole lot of projects tax/rate payers' money has been utterly wasted on. LDY wouldn't be in the top 10.
As an aside, and getting back to BFS, LDY serves as a timely reminder of what happens when you get into bed with FR. Be careful what you wish for.