I think you misunderstood me. Put simply, ProductHunt's popularity means that once a startup hits ProductHunt, it's no longer "little known."

There's nothing inherently wrong with that, but the OP's suggestion that ProductHunt is a great sourcing tool for VCs looking for "little known" startups is flawed. If you're a VC compelled to find promising startups before every investor in the Valley knows about them, you now need to find startups before they are ProductHunted.