Let me present you the most ridiculous reason ever!!
I left the forum 2 years ago, the reason was I became a perfectionist!
I created this account when I was in the university and I was obsessed with merit system at that time. Luckily for me I got merits for few posts and I needed to achieve merits for each and every post and It grew in to a headache, I put a lot of effort and thought most of the posts. I wanted to have a post count which does not have a mile difference with the merit count. Later this became stressful and I learnt that I do not know enough knowledge about Crypto in order have such high expectations.
Then I left the forum, stopped logging in, stopped worrying about merits nor posts.
Finished the degree, started a good job and just today I logged in and posting this!
Now the obsession is over, I am here to freaking stay!!