That is not how it works.
And postal 2 has a cult following.
This. Also, not every player is on the forums, not every player's hit Greenlight. Look at how long it takes a project to hit 10,000 upvotes at CUUSOO. Also, Steam hasn't even set a fixed number for upvotes- it's based on what other games are getting, so as bigger communities get more upvotes on bigger projects, we're going to be left in the dust- that's probably why games are making it on without getting to 100%.