I think it's because he isn't completely proven in bigger leagues. You wouldn't want to spend 15mil on a player and find out that he's only a decent player.
Donovan is a great player from what I can see, though. A hard worker and versatile on every attacking positions.
I honestly think it all matters on the developments of JDS and Thiago. If they're good enough, they can play back-up for Xavi, but let's hope that Xavi stays healthy most of all :)
We at least know that JDS and Thiago can't be considered as true DM's...more like Xavi/Iniesta than Sergi. Keita may be able to fill into the DM role, but he's too good of an attacking threat when moving from deep, but he won't be able to do that when playing as a DM.
We need a back up for...
I'm not sure why Oezil is still optioning for Real, seeing that Barca are his favourite :)
I hope we get him, but if we don't, then I hope Real don't get him. I like his style too much for him to go to Real.
It's more about pride, really. We've never gotten paid to wear a sponsor, and although I'm a fan of helping out Unicef, the shirt looks a beauty without a sponsor. If we got a sponsor, we'd just be like everyone else.