Ranking by upvotes/comments seems highly problematic, even with HN's antibrigade features. A) There are many external factors that can implicitly cap the number of upvotes/comments. (time submitted, amount of competition, etc.) HN has repost rules to alleviate this problem: would Apply HN posts be able to repost too? B) Not to mention that it encourages sockpuppet voting/commenting, especially since there is a high r…
Another thing to watch would be the mean user karma of all votes. A bunch of low-karma vote stuffing would actually bring a post down.
If you can get a ton of massive karma users to upvote and game this, maybe you should just get in by default?