Good post.
Here's the reasoning:
If the post count/account date rules were the only thing hindering sockpuppets I'd fully agree.
However we're going for a big mix of different variables rather than say just 100 posts or activity on BTT. This is both to even out things so not only veterans around here can get in but also to make the filtering proccess more obscure and thus difficult to get around for those aiming to cheat.
Other checks should help get around the puppet issue, and requiring a NXT account and doing IP checks should stop many of them. I'm just thinking of those who, for lack of a better word, are sort of evil here... there is a greater proportion of hackers + those with pc knowledge than other places, so obtaining multiple IPs, multiple NXT accts, probably won't be the most difficult thing for them. If you have other checks which you haven't made public (which would be wise), maybe it'll stop those too.
And yeah, if you make the post requirement too high, it may be harder for new people to get coin, so I get that. A middle ground may be best, in my opinion ... something like 50-100 posts, or more coin for those with 100+ posts, etc. Again, besides hindering sockpuppets, ideally distribution would hinder dumpers as well. Too many freebie coins get dumped to smithereens almost immediately. The coins that actually handled that best so far probably was com and itc (at least they lasted long enough to hit the big exchanges)... com's distribution was iffy, but itc did the tiered post thing.