I think I'd have to charge around half that to actually get enough business to make a living doing only freelance.
Or you'd have to take it seriously enough to do the legwork you need to have enough clients at your current rate. I found that the more contract work I did, the more demand I had for my time. This, of course, assumes doing really good work for people that interact with other people that would need my particular skills.
You may be right. Like I said, I never really tried. Then again, I've had people show genuine interest until I quote a price. Maybe I'm just attracting cheapskates.
Half that may not be enough. Don't that you'll be in charge of all business expenses and more tax (if in the US, you'll have to pay an extra ~7 percent right off the bat to cover the half of social security your employer pays on your behalf).
Also, a lot more of your time will be taken up by non-billable hours.
I think I'd have to charge around half that to actually get enough business to make a living doing only freelance.