Yes, if you get famous enough and people WANT to pay you to do more
No, there is not a charge. You can sign up for free, or just watch videos on your own without an account. :]
No, having a YouTube account will not affect your computer in any negative way.
No. Sort of, depending on what you mean by Account. You can actually subscribe before having a user Channel. But there is a difference between having a Channel, and having an Account.
Nope, a YouTube account is free. To create a YouTube account, you need to have a Google account which is also free.
On the address mentioned in the Adsense account associated with your YouTube account.
No
no
Yes, you can. The harshest penalty available is being banned from having an account on Youtube.
No, YouTube is perfectly 100% free.
Yes. Commenting on YouTube is free. All you have to do is having an account.
It is not possible to post a comment on YouTube without an account. Posting comments on Youtube is a prvilege you get with having a YouTube account as this also attempts to deter potential mass spammers and cyberbullies.
No, it doesn't.