Friend Camp has about 50 active users and I just noticed we have more than half a million posts here since August 2018! I mean that's 11 a day per person on average but still. That seems wild to me.
Last I checked something like 75% of our posts are unfederated. That's still 125 thousand posts sent to the fediverse. I think local-only posting increases the vitality of community, increasing the volume of overall activity, and contributing more to the fediverse than a less vital instance would.
(Above post reposted due to silly math error)
In other words: if Friend Camp never had local only posting, we would not have cohered as a community, and we would have contributed far less to the fediverse as a whole than we do with the ability to post unfederated.