Isn't it advantageous for a company to use StackOverflow instead of a forum?

I'm a coder, and there's still a lot of companies using crappy web forum software.

Why run a forum when you could point customers to StackOverflow, and have your tech support guys lurk there to help them?

Reasons I see it would be advantageous:

- don't need to host a forum (less bandwidth, server usage)

- better answers as there's less duplication, and bounties for unanswered questions

- but most importantly, people like me look at the number of questions/answers on StackOverflow to see if a new product is worth pursuing or not.

Full disclosure: I am not affiliated w SO, but I am a fan and regular user.