This really comes down to confidence in your ability.

I wrote http://myanimcalcam.com by myself. This site is definitely more complex than a standard Wordpress install, but didn't require a team.

I also find adding features to existing sites a good source of "interesting" income. "I've got a website that does this but I need it to do this too" is a common problem I solve for my clients.

Also I'm not afraid of straying away from the "I built websites role" by producing in house systems for companies. A lot of these applications can be done by a single developer.