Both the comments and the tv stuff indicate clearly the reason for the so-called "idea" - cheapest publicity you can get. Cawley has been well trained by M. O'L
BTW, one has to ask why RTE bothered - they wanted to add to the opinion 'Ryanair will try anything' or they wanted to 'knock' Ryr, or, most likely, they actually believed it.
Think, how would it be done? A fee at booking, on what basis? No control at boarding, so whatever you can carry??
I'll be amazed....