I'm not sure what this question is asking, but for the most part, you do not have to pay for anything on YouTube. It is free to upload videos, and it is free to watch videos. Those basic functions are free but there also are some other things you can pay for, such as promoting your videos by paying for an ad on the site.
No. Both being having a YouTube account and uploading videos are free. You only have to pay if you promote one of your videos.
Youtube is a website free to its users, you don't have to pay
Nope.
Having a YouTube account, watching and uploading, and commenting are all free. Youtube does offer the opportunity to have videos promoted, where you essentially pay to get extra views on your videos, but this is not something you are required to do.
No, YouTube does not pay any royalties to YouTube content creators. YouTube pays users who monetize videos by a pay-per-view basis and the pay per view total can be cashed out when a YouTube user reaches the $100 threshold minimum.
No, you can sign up, upload and watch videos on YouTube for free.
No, no one needs to pay money to comment on any YouTube video.
Yes you do.
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There are many places a person may watch full concert videos. For instance, there are some full concert videos on Youtube. Additionally, Hulu and Vimeo have videos of full concert footage.
No. You can pay to have it promoted on the front page or in various advertising boxes, but the basic service of having videos up there is free. In fact, popular videos receive money FROM YouTube for being popular and generating views.