My business started as a hobby and has grown significantly (due to SEO ranking improvements) over the last couple years. We're now at a point where we (my wife and I) can no longer handle the volume that's coming in. Our options right now are a) hire an employee to help reduce the load or b) remain small and stagnant because Google could cut the cord any minute.
I'm trying like hell to find alternate traffic streams like Adwords, Facebook, Mobile, etc, but I can't quite figure out how to make a reasonable profit with them. So for now I guess I just have to take the risk. No guts, no glory.