I actually called the IRS and asked about having to be registered as a money transmitter.
There response was that ANYONE who buys, then re-sells, etc IS A MONEY TRANSMITTER AND MUST FILE IF EXCHANGE OVER $1,000.
If you report your BitCoin income, then audited, and not registered you will be in trouble.
Calling the IRS...
And talking to someone so unimportant that they field public phone calls...
Is just about the dumbest way to get reliable information.
As for the last part...
Does the IRS arrest hookers/pimps that declare their income?
Basically, the Government is not responsible for "helping" you obey the law...
The onus is on entirely on YOU to hire specialists like Securities Lawyers or Certified Accountants...
But you will certainly get a variety of opinions... and that, again, is YOUR problem.