Probably limited to due to the bandwidth it would take up. It's not a bug, that's for sure. Think of if 100 people have it set to 50 posts/threads per page, that's a lot of server load in a very, very short period of time, then double that if it were set to 100, and then consider how much you're browsing NA. Assume that people stay on a page, at average, of 1 minute, browse NA for an hour on average, that's 60 clicks per user at 100 users, that's 6,000 clicks. Say each page load is 5k, that's 30 MB in a short period of time which, no, isn't a lot, but assume that's the average per hour, that's 720 MB a day, which is over 2 GB a month. I'm sure the usage stats are significantly higher, but I'm sure it's for a performance purpose.
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Proud owner of post #1800 in Inner Circle HQ thread