Look to Tiger airways in Australia - I remember seeing their own terminal at Gold Coast Airport they had bought off the airport and it did indeed, lack ongoing investment and turned in to a bit of mess, probably still is. I hate flying merely due to the fact I think most airports have an awful experience to offer, imagine Oleary terminal and how tacky it would become, ala Ryanair. If the Ryanair inflight interior is anything to go by, I'd sooner use EI in to Dublin to the main terminal than FR to Oleary terminal.