Well part of it is I burn my accounts every couple of months and over time I've gotten fairly good at crafting what I say in a way that more HNers are receptive to.
The other reason is because I have a lot of meetings that I need to attend that aren't all that interesting and mindlessly scrolling and commenting on HN keeps me from falling asleep.
But sometimes I'll admit to posting things in a way that overstates where I stand on a issue because I've found HN is one of the place I can get a detailed and reasonable answer on where my thinking is faulty. Heck I've had my mind changed multiple times when someone gives additional information to me.
Getting posts to the front page is big business. A launch via ShowHN that hits the frontpage is easily going to get a business going with signups and users that a flop of a post that never gets seen, won't. But you can't simply make 1000 accounts via the same IP, wait three days before using them, and then upvote your story. That'll set off the ring detector and your upvotes won't be counted and you'll never reach the front page. So you buy aged accounts with rich comment history to do so instead. Not that I have any proof of this happening, but the motivation for it should be obvious.
I would encourage you to spend more time submitting posts (looks like you have none on this account), and browsing https://news.ycombinator.com/newest and seeing what fails to gain traction and get upvoted, to disabuse you of this naive notion. That the frontpage is so fickle is such a known problem that dang created* the Second Chance Pool** to give good links another opportunity to rise to the top.
Flagging damaging information is valuable to companies who get featured on HN. A brigade of puppet accounts can make inconvenient facts disappear fast.
