Actually it is more to do with opportunity and expansion than flying conditions. In 2010/11 Pegasus got rid of nearly all foreign Captains to allow for locals to be upgraded. In 2012 The Turkish Government implied they would restrict foreign FOs to 10% of the work force employed at any carrier, this was later amended to " foreign licence holders" thus if you convert, the numbers shrink. Pegasus had an aggressive expansion program and ramped up Izmir and Istanbul base, coupled with a positive upgrade program for the local FOs. Those same young upgraded FOs now have the opportunity after 3000PIC to go to Turkish as DEC, thus there is now a shortage. Pegasus know that Sun Express successfully recruited foreigners with the lure of commute contract from Ankara base, as do Bora Jet on the 190, their strategy is to try and coax SXS guys from Ankara to SAW as SXS does not allow commute from SAW, getting to Europe from Ankara is a pain, also to attract new guys directly to SAW and move guys from SAW to Izmir. Rosters are issued weekly so planning is bound to change. Money is apparently good as sectors are paid rather than flight time, but as anywhere in Turkey work is hard. Turkish DGCA want to adopt EASA FTLs next year and this means at least 10% more crew per carrier. Horses for courses I guess, but the DGCA is now making another rule preventing DEC from Turbo prop to Jet, again the pilot crop will be limited as Turkey was a good opportunity for prop captains floundering in Europe.
Pegasus staff travel is confirmed on Pegasus routes, whereas THY has all Star Alliance routes and ZED agreements practically everywhere, just a thought.