I spent more than 5 years in the Twilight Fandom, so I know one or two things about the People's Choice Awards (PCAs), MTV Movie Awards (MMAs) and Teen Choice Awards (TCAs), although I'm not a Teen anymore
If a show/movie/star wins such an award, that doesn't mean much about one's skills or the quality of the product. It also doesn't mean a thing for the industry or for your credentials.
Because people can vote more than once, it's all about the fanbase. So of course for years, the YA-Blockbuster got all the awards (Harry Potter, Twilight, Hunger Games) - because the young people have time to vote on social media several times a day for several weeks.
So because not everyone had the same chances to win, they changed the game for some of these awards a few years ago. It used to be the fans that could nominate who would enter the competition. Now it's a jury that nominates for the TCAs and MMAs - which means movies like "12 years a Slave" or actors like Brad Pitt are in competition (let's be honest, that would never have happened otherwise - teens and the MTV Generation of today would still vote for Justin Bieber, "Hannah Montana", Daniel Radcliffe, "Vampire Diaries" or "Pirates of the Caribbean" like they used to).
Also, almost all of these awards shows are rigged: You don't get the trophy if you don't attend the event; even if you have the most votes. If so, the prize goes to second or third place (but the audience doesn't know about it). They probably want the big movie stars to attend - but most of them don't because they don't have the time (or don't care about it). So actors like Johnny Depp (for the Pirate movies) or actors from big franchises like "Star Wars" or "Harry Potter" did often, but actors like Tom Cruise or Brad Pitt usually didn't, even if they were nominated.
I guess the cast of MacGyver would attend because CBS could use the free promo. But I'm not sure if the fanbase is big enough and willing to vote like mad maniacs over several weeks. So I doubt they would win because of the votes, but because the winner wasn't there to claim the prize.