Dead sections are bad. But I think (emphasis on think) that if you make each category broad enough, a lot of the normal day to day conversations can fall into them.
For example, "how do you grow your client list" would go in the business section. Or "What do you use for your website?" or "how do you get bars to pay you?"
If it's too businessy/markety, I think people will stay clear. But there's a lot of discussion about the audio business that pretty much everyone can take part in, even if they don't do it for a living.