I hate to piss on that guys parade (Not really, I will enjoy it) But much of the beer HE sells ain't as good as he thinks it is. There are some good brews out there, sure. Many of them though are merely adequate, and even more of them are a damned rip off. The only thing they have in common is that they are ALL over priced.
Hoo-yah! LG called it. There are many microbreweries out there, many are in it to make good beer, but more than a few started up just because they see it as a way to make some money and cash in on the "big thing". I have had some very disappointing commercial beers, even ones that were hyped. For many "beer snobs" they automatically give something a positive review because they paid good money for it, or it came from a certain brewery. Most of these "snobs" don't know a damn thing about the beer they are drinking, how beer is made, and what an "off flavor" is.
With homebrewers, many of us have an appreciation for good beer and we know how it got to where it is. We've tasted off flavors, we've had infections, and we know when something isn't right or when it's watery, bland, etc...