I figured that would be the case, but we're talking Jason and Guinness here! :) He might do it for costs + a two-day Dublin brewery holiday.
(NB: I have no vested interest, as I'm much closer to London than Belfast! And ... is jokes. ...Kinda.)
He probably just keeps coming over because of the easy access to Guinness... :) Don't be too surprised if he's here every here there's not a scheduling conflict!