It seems like it is just a TV thing. I have never seen those balls in person. Billiard supplies sell the normal balls. The ball color thing may be a non issue.
i've seen them in two pool halls, and nevermind the purple 5 - these balls are useless in any game other than 9-ball. balls numbered 10-15 are hard to distinguish from each other, and from the 8-9. not all pool halls are well lit matchroom arenas lol.
i don't care as much what the elite plays on in televised events, it's a different game to mine anyway, as it should be. i'm not playing on 4" pockets either. if the use of these balls, and the grey cloth etc, helps to create an interest in the sport i'm all for it.