That's not the way it works. You can steer things your way for a while but everyone is looking for the conspiracy. I knew a guy who was dumping affiliate links everywhere (because everyone was innocent once) and flagrant shit like that was making him a couple hundred bucks a day. But you're discounting the deep distrust all the ad agencies and content producers have for Reddit because they lie about their metrics and consider themselves unaccountable to everyone.
We ran $10k worth of advertising on Reddit once because we were true believers. And despite the fact that I had a herd of anime lovers running ads about new anime for anime lovers in /r/anime, the end result was a bunch of doxing and flamewars and DDOS of servers because,
and I say this with no quaver in my voice,
The Reddit demographic is utterly fucking worthless.