Yeah Jack, but how much would you have paid with a "Traditional" airline??
Ryanair has a fairly simple but effect Revenue Management system, which effectively matchs price with demand (as any Rev. Man should) so therefore very busy routes like Treviso tend to be more expensive than thinner routes but still significantly less than standard fares on other airlines.
It also depends on the length of stay and when you booked the flight..... if you book a flight the night before and expect to go and return on the same day then of course it will be the most expensive (because you are likely to be a business traveller)
It is all very simply economics, and a concept that MOL (et al.) seems to have mastered.