1) Everyone adjusts the Reputation score as they see fit, because it doesn't really depend on the score itself; it's just an attitude towards the POST.
2) Various holidays, etc., are indeed an easy way to increase the score, but there are no perfect systems.
3) Separate respect to Vayshan for
I increase the score for someone if I really like the post
And yet, as Vayshan rightly pointed out, many people take the Reputation score seriously, especially newcomers.
P.S. Here's an example of increasing the Reputation score. I agree with Vayshan's post, I think it is very high quality, correct, and raises an important issue. Therefore, I am increasing his Reputation score :)

Барон "Vampires"
Отдай свои прошлые сны,
В сомненьях себя обрети,
В бешеном танце душа кружится!
Не думай, что будет потом,
Здесь и сейчас мы живем,
Стань хоть на миг сам собой, слышишь!