[brosirmandude]

It could be this, but I also think it's just...no one has any idea how to market on reddit via paid advertising. Obviously /r/hailcorporate exists for a reason as many marketers are successful in marketing on reddit "organically", but those don't go through their official advertising system.

Reddit users as a whole seem averse (much like HN users) to ads. I would imagine conversion on reddit ads isn't very high, but I haven't looked at any data on that so I could be wrong there - just a feeling based on comments I see from many reddit users.

Also it's hard to implement ad types on the platform that don't piss off users or use shady tactics making them "blend in" to the organic content of a reddit page.