[ Well, that European success might be a reason to leave Besiktas. And just a nicer competition, the competitions in Germany, Italy, England and Spain just have more quality, so of course that could attract players.
Sure, the Turkish competition is more attractive than the Dutch one, simply because of money, but it's also the pain of Ajax as a Dutch club: if you look at what former Ajax players are world-class players in top competitions now, you could say Ajax would be a world-class to team now if they would've been able to keep their top players for a longer time. Unfortunately, that's not possible, the Dutch competition is just less interesting for good players. This is a team I just made out of eleven former Ajax players currently playing in other competitions:
---------------------------Huntelaar (Schalke)--Ibrahimovic (PSG)-------------------------------
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--Eriksen (Tottenham)------------------------------------------------------Suarez (Liverpool)--
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---------------------Sneijder (Galatasaray)------De Jong (AC Milan)----------------------------
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--Maxwell (PSG)--Vertonghen (Tottenham)--Vermaelen (Arsenal)--Van Der Wiel (PSG)--
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--------------------------------------Stekelenburg (Fulham)--------------------------------------
Bench:
- Lobont (AS Roma)
- Alderweireld (Atletico Madrid)
- Seedorf (Botafogo)
- Heitinga (Everton)
- Anita (Newcastle United)
- Van Der Vaart (HSV)
- Chivu (Internazionale) ]