Considering how so many people seem to be trying to game the system, I think these limits are useful. I'd even restrict people to posting no more than 2-3 posts in 24 hours. I see a lot of people here posting way too often just trying to eek out anything they can.
If we keep this up we're going to get way too much quantity and not enough quality.
I think that 2-3 posts would be way too restrictive.