The boxing superstar was out spending some of his millions in Bev Hills on Wednesday -- when he took a moment, called over ALL the paparazzi and gave 'em a pep talk right in the middle of the street.

"I support all of you 100%," Mayweather said ... "Without the media, I wouldn't be where I'm at."

Of course, the guys ate it up ... and then hammered Floyd with Conor McGregor questions -- continuing the hype machine that could lead to his biggest payday of all time.