In Ronnie's DVD Cost of Redemption.....
he Chalks his hands & wears gloves....(which I thought seemed a little unusual) but ok...He's Big Bubba....I'm not going to put much thought in what he decides to do for his training aids.
As for pro's wearing gloves....some of these guys, Cutler, Cormier, etc....have good contracts with these companies so you're going to see them wear their gloves for photo shoots, Dvd's, etc... I'm not saying they wouldn't if it wasn't a photoshoot....but it definitely needs to be considered.