So everyone who register and write something in offtopic is spammer?
Most probably, yes. Why would anyone join any forum only to post in Off-topic? I can think of many reasons to join Bitcointalk, just not this.
Before the Merit system, Off-topic was used by account farmers to "build accounts". Somehow some Newbies still don't know that's futile.
if you are call all of us spammer as we write posts in offtopic, why is that section open?
It's a honey pot to keep the serious boards free from spam.
What should I write if someone want to know opinion about mouse, headphones, electric car etc.
Allow me to answer this with a different question: What would you write on - say -
Pet Mouse Fanciers Forum if you want to talk about your electric car?
I haven't seen this on any forum other than Bitcointalk: you don't go to a specialized forum to discuss something that belongs on another specialized forum, if you can go to the correct forum to start with. Even better: why would you join the wrong forum if it charges you $20 for your account?