I did a bit of this a few years back - the folks who did not already have their act together on the web were easy sales, but terrible clients. (Looking for cheapest deal, wouldn't give you time to talk through their needs, just wanted you to magically put something online and have it creates sales for them.)

Or, you had people who already had their web presence figured out, and did not need much. A little SEO cleanup, maybe some content updates - not enough to sustain a business.

I ended up actually finding good clients with decent income by sliding right back into dev consulting, custom coding business-specific CRUD/LOB apps. After about 6 months, though, it was just the same old corporate coding with added sales headaches... so I just got a job and called it good.