Yet I can't ever think of a Ryanair flight I've seen go out with a single spare seat. There are plenty enough people who don't mind abuse of the save a few cents. Good luck to them. Keeps them off my flights.
So feel free to add my anecdote to yours, and derive nothing statistically significant besides that I fly a route that is only intermittently popular.
..I'm also flexible on dates so I deliberately book cheaper days, which may make for self selection in this way.