Selam I agree with dlatua, seoking is the correct form. It is not something about "habits" it is the grammar of English. It must be Seo King or King of Seo to be meaningful. I think you are thinking it in Turkish (like kraloyun). Regfee or couple of bucks more (as it is aged), undeveloped. With a good marketing or a developed website it may worth more. Good luck.