150 posts per day seems bad in usual context, but if you joined like a week ago then you have an excuse I guess.
They're just excited to finally have an account. After all some of them did wait like 2 years, so you can imagine everything they've been waiting to post in.
If his post average was 150 per day after 1 year, then yeah, that'd be a tad cray. But it's like 1 week so far, during Summer, after waiting to join forever.