it's that way, but twitter limits their API to 300 posts/user/3hours, and some power users hit the limit

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there's a little star on the documentation saying that an app can only create 300 Tweets per user or per app for every 3 hours. I believe that the influx caused a lot of new power users from twitter, that post a lot, to come over and that's now causing the crossposter to hit the limit.

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If a real person (not a bot) can tweet more than a 100 tweets per hour (i.e. 1 tweet every 36 seconds on avg) I would call them mentally ill, not power users.

True. So if anything, they are being very generous with the rate limit here. I think they should dial it back to 10 tweets per hour.