Why do you need to have a certain amount of comments in order to be able to post a link to the front page?

I've just come across this brilliant documentary about Richard Feynman, but I'm not allowed to post it.

You cannot post to the front page at this time. This can be due to one of several things. You may not have been a member long enough, you may not have posted enough comments, or you may have already posted a link in the past 24 hours.

I've been a member for quite a while and haven't posted any link on the front page yet, so the reason must be that I lack the required number of comments. I understand that people need to have an idea what kind of links are appropriate on the front page; the question is whether the amount of comments one makes is a good metric to determine this. I don't often feel the need to comment on front page postings.
posted to MetaTalk by koenie at 10:15 AM on April 17, 2006 (42 comments)

I've tried searching MeFi for similar requests, so please don't shoot me if this happens to have been requested before.

Anyhow, in the Ask MeFi section, wouldn't be handy if one could see the number of days one has to wait before being able to ask the next question?
posted to MetaTalk by koenie at 2:21 PM on May 9, 2005 (15 comments)