are these prices "excessive" as in the company is making a 25% rate of return on capital or "excessive" as in "we want to pay nothing"?
If the profits were so high you'd get EasyJet or RyanAir there in a flash - but you don't so maybe the profits are pretty grim
the various islanders could use everyone's local taxes to reduce fares but that would be the many subsiding the few
I've been in lots of remote spots around the world and unsubsidised fares are ALWAYS higher than STN-Ibiza