Rees, 32, will fight Broner for the WBC lightweight title in America on Saturday night.
Some Atlantic City bookmakers have apparently given odds of 80-1 that the Welshman will win, but he has no problem with that.
On hearing of his massive outsider status, he told Wales Online: "If I can find a bookie in Atlantic City who'll offer me those odds, I'll be putting big money on myself.
"They've never heard of me but that's okay. [Broner's behaviour] is little disrespectful, of course, but what can you do?
"I know I'm talented and have a real chance, and that's all that matters."
Rees has only lost once as a professional, and did hold the WBA lightweight title for a period. He is currently the British and European lightweight champion.
Broner has won all of his fights, winning 21 of his 25 bouts inside the distance.