If the business of your company involves Google advertising and getting hits on Google searches, it's a bad idea to completely block Google from indexing the site.
HN elitism at its finest. Some people out there actually run their internet businesses to put food on the table, not just to stroke their techno-libertarian side-project erection
Virtually every business model involving the internet relies at least partly on Google, so while your comment may be true it isn't particularly helpful.
Helpful? actually I've been pitching this same idea (don't rely on Google traffic for your business model) since 2004. I've seen too many businesses FAIL and have to lay off employees because they relied on Google traffic.