Up to a couple of years ago I probably bought ten or twenty tickets a year with them but (thankfully) never used a single one of them
I was struggling to understand why anyone would buy up to twenty Ryanair tickets a year and not use them. Then my son suggested that he probably bought them as cheap insurance to use in case his Aer Lingus flights are cancelled due to industrial action.
On the "your session has been locked" subject I entirely agree that this happens far too often but, to be fair, I have always received a flight confirmation email within a minute in such cases.