Was a waste of money for me.
Reddit audience believes they should not see ads. They are totally anti-commercial crowd who feel entitled to consume content for free. If you have a look at threads there discussing adblock or ads in general, find one with thousands of replies for better statistics, you'll see that over 80% of redditors really think ads are evil, making money online is evil, SEO is evil, web marketers are evil, and so on.
Unless you find a very specific community to target there, there really is no money to be made on Reddit. I mean, not even Reddit makes money! I think they're on the red for years and years and they can't seem to monetize their otherwise great system, because their users are so anti-commercial any mention of paying for online content makes them flee.