HN's expertise falls short when it comes to adjudicating unicorns as they don't usually look promising at the beginning. But, in case of a small product, I think community's feedback and advice can be invaluable.
I forward stuff from HN that I think is pertinent to the group I run called Business Bootstrappers: https://groups.google.com/forum/#!forum/business-bootstrappe...
So far, that is the vast majority of what has been posted there. As yet, conversation has not broken out and I don't post very much else there.
https://groups.google.com/forum/#!forum/business-bootstrappe...
30x500 (Amy Hoy)
Founder Cafe (Rob Walling)
Dynamite Circle (community by Dan Andrews and Ian Schoen of Tropical MBA)
That's also what we're working on at http://nugget.one and I also think https://www.indiehackers.com is a great resource for inspiration.
It's a shame there's not a Startup School-like resource for creating a lifestyle business (YC-like in that it'd have a unified theory of lifestyle business creation, as YC has for startups, that'd been honed through assisting in the creation of hundreds of such businesses).