I don't mind him jumping ship, as long as he has contributed something and improved the team greatly. If whilst he's here, he helps us win a trophy or two, even better for us. Look at Cristiano Ronaldo at ManU for example.
I get where you guys are coming from, and see what you're saying - he could pull a Nasri/Flamini on us. I'm saying I don't really care- that's the nature of the game nowadays, and its even worse for a team that's not winning anything or truly competing for top honours.
For me, as long as he improves the side whilst he's here, i'm happy. I won't begrudge any player for having ambition or wanting to earn more money. I certainly wouldn't cheer any less if he scores the goal that helped break our trophy drought just because he's not behind the 'cause'.