The occasional memey or off-topic post is a lot of fun and key to having a community with its own culture instead of an interest group with the personality of a dictionary entry. The problem is that people see that was fun and naturally try to do more of it, but it's only fun in the first place because of the contrast, and the off-topic stuff is usually easier to produce so it can easily drown out the on-topic posts, killing the forum.
The "delete most memes" policy is weird, but works well where I've seen it.
The occasional memey or off-topic post is a lot of fun and key to having a community with its own culture instead of an interest group with the personality of a dictionary entry. The problem is that people see that was fun and naturally try to do more of it, but it's only fun in the first place because of the contrast, and the off-topic stuff is usually easier to produce so it can easily drown out the on-topic posts, killing the forum.
The "delete most memes" policy is weird, but works well where I've seen it.