Yeah, I agree, but even then, talking is just one way for these guys to make more money, and even that's not a guarentee. And it's like, are we so cocky to think that we know this secret technique to fighter's financial success, but the fighters don't?
Anyways, I addressed it in some of my other posts, but if I really wanted these guys to maximize their profit, I'd be suggesting more concrete methods of making money than "speak more", for instance Moose was investing in real estate and made bank throughout his whole MMA career while doing so, GSP had financial advisors, Aldo invested in his own business, Kattar invested in his own business etc etc. These seem like more guarenteed ways of making money than simply "talk more!"
But obviously you're right. Talking more wouldn't hurt their chances.
That said, It's not my place either way to be making any financial advice to people. Which is why I just enjoy the fights.