This has definitely been the case for me over at breachinsider.com too – the ShowHN brought our first handful of customers, which have been a real delight to work with and completely fit the description outlined above... they understand the position we are in, and are happy to report issues or bugs they find (and are happy when we fix them in hours rather than weeks).
Generally speaking (and not in anyway a comment directed at the lovely people behind EnvKey), it can be a double edged sword, as if you are seen to only plug your business, even if you do add to the conversation, it can come across as a little disingenuous or pushy. So if you do take this route, don’t forget to be human and post normally sometimes.