Thank you guys for all posts.
My counter offer was depend on sales history for some similar domains:
turkey-evisa.com Sold for $1,230
BuyInTurke.com Sold for $1,050
InvestInTurkey.com Sold for $3,150
InvestInTurkey.com Sold for $3,150
TravelToTurkey.com Sold for $8,000
TurkeyTravelGuide.com Sold for $4,100
TurkeyBalloon.com Sold for $2,500
iPhoneTurkey.biz Sold for $3,500
TurkeyTourPackages.com Sold for $3,100
CarHireTurkey.com Sold for $2,000
BookTurkey.com Sold for $4,500
StudyInTurkey.com Sold for $3,000
TurkeyDirect.com Sold for $2,700
JustTurkey.com Sold for $11,500