1. Your moderators are simply unable (or unwilling) to distinguish "sockpuppets" from a legitimate community of developers (that is the node.js community). Yes, when we post something to HN we send out the link via Twitter and IM to colleagues in the node.js community who may potentially upvote it. This is natural "word of mouth". We have never used bots, or any kind of malicious automation to ensure posts reach the front-page.
2. There is no transparency for bans, nor is the ban every communicated to the owner of the HN account. If you think an account is unfairly trying to manipulate the voting system; you have to contact them. Anything less is blatantly ambiguous and unacceptable.
3. Given the silent nature of bans on HN, we have no choice but to move onto a new HN account and continue to submit legitimate posts using legitimate word of mouth dissemination. Perhaps you view this as "sockpuppets," but what other choice do we have?
4. In the particular case of Nodejitsu, this behavior is even more unacceptable. We are a platform-as-a-service where any user can create a publicly available application on a subdomain of nodejitsu.com. How can you ban the entire *.nodejitsu.com domain when we are not responsible for malicious actions (real or perceived) taken by a given user? This is not an admission that any such behavior has taken place; I'm sure that your claim is addressed in [1]-[3].
In the copyright world, site owners are protected by malicious actions of users through DMCA safe-harbor. In such senarios, the owner of the site will be contacted and the malicious behavior (real or perceived) can be addressed and/or removed. By silently banning posts and not communicating with members of the HN community about what you perceive as malicious behavior you are doing yourself a serious detriment. This has (and continues to) raise questions about the legitimacy of the content on HN as just a shill for YCombinator.
If you'd like to speak with me personally you can email charlie@nodejitsu.com
Charlie Robbins Founder and CEO Nodejitsu Inc.