Interesting, but a lot of what I see is just plain luck:
> A match made in heaven! This community has about 175,000 subscribers
> We got lucky with this one. Our product is specifically geared towards travelers with a thrifty streak.
> successful marketing on Reddit is that it isn't perfectly reproducible. It hinges on finding a community that is both aligned with your product's value, and accepting of promotional posts.
It is trickier to apply this approach in communities 10 times smaller. If you start repeating the pitches you end up meeting people that frequent more than one community and the conversation degenerates into hostility.