Let's be clear… this isn’t about gaming the system to pretend to be an expert when you’re really not. This is about making some smart decisions about how you use your time and how you engage people in online communities. You’ll find, as you put these into practice, that not only will they slowly but surely enhance your reputation, they’ll also give you more time than random, unfocused participation does. You can use that time to go do the same thing in another group or site, or to go do other things to enhance your expert reputation, like write a blog or better yet, a book.
Act like a real expert, not a wanna-be, and you will attract more business.