When they started in 2003, they had the Central European pitch to themselves. This all changed when Malev, Aerlingus, Central Wings and Wizzair all began services to cities such as Kraków, Budapest, Katowice, Warsaw, Berlin etc.
This probably put pressure on load factors and yields and they withdrew in early 2007 having announced their intentions about 6 months in advance. Of course they were also on full charges by this time which might have also influenced their decision.
Reports indicate that Cork are also close to a deal with another legacy carrier.