What do you do? $60/hr sounds low for Rails, iOS, Python, or serious database work.
If you can see yourself billing out $90/hr in June, 2012, why not try this experiment: bill yourself out at $90/hr (actually, $720/day, please) in January. See what happens.
If there is one thing HN people get wrong about consulting, it is that they relentlessly undercharge. It's easy to see why: the stuff they do seems easy to them. It's not easy. There is a worldwide shortage of real, viable talent. Companies are falling over themselves to attract and retain dev talent. The stuff you are doing is not cheap.
If you are billing at a rate that matches what a good full-time Google employee makes, you are wildly undercharging; freelancing is expensive (you are responsible for all your own taxes and your own benefits, and for providing a cushion for yourself for dry spells) and the service you provide (flexible, on-demand work without bringing a full-timer on) is extremely valuable.
CHARGE MORE.