Yeah, Ryanair certainly appear to be in a dominant position and I've always wondered when they are going to turn the thumb screws but they haven't done so yet. Suspect that means there is actually quite a lot of competition in the markets they service and that dominance could collapse if they mess with a price sensitive customer base. I certainly only fly with them if the price is right, if they increased prices too much more than a tenner each way I wouldn't take these completely discretionary trips.
Maybe they are just waiting for the inevitable clearout of competing airlines before they stick it to us. They do speak with forked tongue, but then what airline doesn't?