You can intentionally bait interrupts from a bot that you'd otherwise probably eat by the player itself seeing in current incarnation of the game, it really isn't worth fakecasting at all, and you can do the same damage rotation as the bot can, as long as you have moderate PvE experience, as no bot can maintain a perfect DPS rotation in a arena and that's where you being the human plays into your favor. ( though, fuck reflectbots on bloodhorror ). It's cheating, nontheless, but not as big of a problem as what DIzze mentioned.
And on the other side we have the current incarnation on WoW. In the past there were battlegroups, and there were the better BGs ( Cyclone, Blackout, Misery, Rampage, Cruelty, might've forgotten some ), and you had people running said battlegroups, and then you had the worse battlegroups ( Vengeance, Emberstorm, Vindication, etc ). You usually didn't see players transferring to other better battlegroups just to "steal" R1's ( vileroze's MLD being an exception way back in 2010, that I know of ), people usually transferred to the shitty battlegroups and done their business there. Now you have a significantly smaller playerbase and a global ladderboard, with most of good people who used to play being long gone, and the people who remained playing after the oldies quit running the stuff now ( and the important part being that there's significantly less top players than ever before ). Those same people apparently have all the time in the world to sit infront of their PC 24/7 and Honorbuddy their various alts to maximum level, along with playing the boosts. If you don't get what's wrong with that, then you fail to see the grander picture.
The hilarious thing is that people basically support this kind of monopoly. They watch all these streamers and support them via various donations/subs, maybe even buying boosts from them - basically telling them that it's okay what they're doing. Also, it's worth noting that the players in question aren't at fault either, they just want to play and have fun, seeing once they reach a certain point in MMR they can't get queues for longer periods of time, so it's only natural to make new alts and teams. Anyway, if those same people who are part of this Twitch "culture phenomenon" bullshit opted to actually play the game instead of glorifying players at the top ( which are nontheless solid players, the few times I've opened twitch streams of said players I saw nothing but consistent play and a clutch move here and there, but at the same time nothing special ), and actually got better at the game, maybe this game could be as good as it used to be, because then those same players could create a bigger population at the higher levels and create more active queues - the only thing WoW arena really needs ( except Blizzard starting to actually listen to community after 7 years of not doing so ) is a bunch of fresh new talent that actually cares about the game.
I remember the time when I've fought all the other teams from top 20 at least few times a week, and then people started caring too much about rating and titles in WoTLK and onwards. R1 titles was by far the worst thing Blizzard ever could do for the sake of arena.