I also have a few different accounts, while keeping my main account more 'professional'. I do it for a few reasons: the HN hive mentality hates dissenting opinions in general (doesn't matter how well written and based on facts), everything has to be super politically correct these days and the 'cultural fit' mantra could mean I would have a disadvantage getting a job (since many employers/startups will check your comment history to decide if you're a "fit", while simultaneously posting on their blog about diversity efforts).
I'd say keep using your throwaway accounts. It's not the end of the world you didn't get to promote your side project in this thread.
Well. In the current era of NSA and surveillance, it makes sense to make a new account for every message.
I'm kicking myself since this appears to be a good opportunity for some self promotion. Fuck Me.
Edit: This is making me realize that I should stop being an anonymous coward and put myself out there to try to make my projects and I known to the world. I'll make this my new year's resolution.