I think the recession started just at the same time the major promotion of the tickets began. The figures had been done and the calculations were that sell the Vantage tickets and all would be well in the garden. Pre-recession they were not "ridiculous vantage tickets". Presumably this was the advice the FAI got from their professional financial advisors. The FAI were stuck between a rock and a hard place. For years they had been crucified for not owning their own ground. They took the sensible decision to part-own the ground with the IRFU. Imagine the damage now if they had gone out on their own?
One of their main financial issues is that the international games are not being well attended for a number of reasons. When Trap goes, they need to be very careful in who they appoint. Alex F would bring the crowds back for 4 or 5 games or some such "celebrity" UK manager. And of course qualification for Brazil would help.