Aye, there's something I read in the transfer window where SAF confirmed in his book that RvN asked to go to Madrid the season before he was sold iirc. I was always under the impression he was sold because of his falling out with Ronaldo & SAF, but apparently SAF confirmed he asked for the move before.
Beckham, IMO, was definitely sold after SAF and him fell out. Hes a tough one to call IMO. He's United through and through - so I always wonder if he'd have retired with us (like Giggs and Scholes) or if his commercial aspirations would have led to a move eventually, anyway? I'd like to believe the former, of course.