From the article I linked to in my comment below:
Update, 4:45 p.m.:
Ron Paul issued a statement saying he declined to speak at CPAC due to a scheduling conflict.
In a statement provided to Whispers, Paul said that he did not turn down the invitation to speak because CPAC would not pay a speaker’s fee.
"While I have enjoyed speaking there in years past, I am unable to attend this year due to a previously scheduled engagement,” he said. Paul spokeswoman Stiles could not confirm whether Paul asked for his customary speakers fee to deliver an address to CPAC.