I'm pretty sure Anand gets to keep most of the things they send him to review. That's how he can do roundups etc. There's probably exceptions, certain products he has to return (such as a Kryotech machine), but for the most part he probably gets to keep the stuff, and probably gives a fairly good deal of it away to people that help him with projects or moderators etc.
Just my guess, I certainly don't have any inside knowledge on the matter.