No doubt Perelman feels it is a matter of principle. He felt unduly neglected by the mathematical establishment when he contacted prominent mathematicians to discuss with them his approach.
I can only hope his mother fully shares his viewpoints if he still lives with her...
+1 for "I hope his mother fully shares his viewpoints".
That being said, it appears he also declined several great job offers. Some people just don't live for material things. Most people say they don't, but their actions (including mine) say differently.
I can only hope his mother fully shares his viewpoints if he still lives with her...