I did make some money through PHP. Very much so! That's several months ago though. I used to charge ~$60 an hour which is reasonable, but not too over the top. I think you should definitely find a price you're happy working for, and then add $10 or so to it. That way you're not flooded with clients, but rather the clients you do attract get your undivided attention. Although you could get thousands more clients if you charged a pittance, you'd be working yourself to death and because your time will be shared amongst many clients, they won't necessarily be getting customer satisfaction.

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The man who comes back through the Door in the Wall will never be quite the same as the man who went out.