I found myself at TFS yesterday afternoon, looking to get to DUB. I asked the nice lady at the Ryanair desk about buying a ticket for the flight, and was quoted a shade under four hundred euro.
Monarch to Luton was a quarter of the price. As such I ended up going to Luton instead and hopping on the first flight of the morning from there - total cost, including accommodation, just over half that of the direct flight.
To the point of this story, then - it seems to me that Ryanair should look at selling last minute tickets at sensible prices. At the time I was quoted it was no more than an hour before the flight, at which point the chances of the seat being bought by someone else must surely be negligible. I don't run an airline, but for me I'd rather take some cash rather than no cash for a seat that is otherwise going to be empty rather.
I was, incidentally, traveling with hand luggage only.