I agree with Shazam. The main thing Anand has to offer is his objectivity, and if he gets involved in any way in selling products he reviews, his credibility is gone. If Anand's credibility is gone, then soon the whole site becomes nothing but yet another reseller web site that you can find by the tens of thousands.
The money Anand makes from ads is way more than he could ever make as a reseller and the reason why is that people trust what he says about products. If people thought his integrity was compromised for the sake of a few bucks made on some cheezy components, they wouldn't come back here and there would be fewer hits and therefor less ad money. There would also be fewer people coming here to buy 'in bulk' and he'd lose out there, too.
Becoming involved in sales of product is a lose-lose situation for Anand, and US!