What's a good hourly rate to charge for Smll Business Consulting?

I've read several comments speaking on the cons/barriers, so allow me to play the devil's advocate and speak on the pros/advantages. 

Small Businesses focus on Operations

• One reason any firm hires consultants is because their current employees (or themselves) are in the weeds of their operations. Some of this may be non-management businesses like owning a small restaurant, convenience shop, or offering their own services (like massage/physio). Their core expertise may lie outside of business altogether and may need a hand in record keeping, business strategy, website design or a number of things dependent on the size and scale.
• You're focusing heavily on Root Cause Analysis, but that's just one faucet of consulting services, you can look into opportunities or expansions on behalf of the client. A simple idea would be to create an online presence for a local pizza store that don't have one (free LI with promotions, maybe a Twitter, etc.) or convert the back-end accounting for a convenience store that's mostly paper-based to a software for longevity.  

Never Underestimate Referrals/Word of Mouth

• If you want to try this out, target your local mom & pop shops and pitch them services pro-bono with the condition that they must leave a review/testimonial and refer you to some other folks they know. Once you get the ball rolling, they can champion your utility and it costs nothing to them to give you a shot.
• The other approach is to target your network and see if any of your friends/colleagues are brainstorming (or have?) a start-up that needs a whole mess of administrative services - maybe a high level financial model to show potential VC firms, maybe accounting services or they have problems with their product design.

If some of these skills are outside of your experiences, take free courses and start small. Just my two cents on the pros to this.