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.
Yes, you can. The harshest penalty available is being banned from having an account on Youtube.
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, 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 is actually to upload videos and video chat with other friends.But a youtube accoint can give you the freedom of choosing your fav. videos also.
Yes, if you get famous enough and people WANT to pay you to do more
No, you don't have to. You can use it to subscribe, comment and make playlists.
Yes.
facebook account, youtube account, itunes account, having an ipod touch, part time jobs like paperounds or working in mcdonnalds.
No. Both being having a YouTube account and uploading videos are free. You only have to pay if you promote one of your videos.
Yes. All you have to have is an email address, but you can get those for free from google, yahoo, etc.