After July's well-received joint appearance onstage in Jamaica, and an enthusiastic remark that producer Bryan-Michael Cox made in an interview with Jermaine Dupri ("Usher and the boy Chris Brown are going on tour, y'all know that, right?"), fans expected a major concert collaboration to be announced.

On Tuesday's broadcast of BET's '106th and Park,' however, Chris Brown dismissed the rumor while plugging his film 'Takers,' saying he wanted to focus on solo efforts. Many questioned the explanation, and speculated that Usher -- whose reps have issued a statement denying a tour partnership -- wants to distance himself Brown, still struggling to repair his image after his notorious 2009 arrest for assaulting then-girlfriend Rihanna.

But now, a source is telling the New York Post that there's a much simpler reason: money.