Not only do subtitles and closed captions help viewers, they also help optimize your video for search by giving you another opportunity to highlight important keywords. You can add subtitles or closed captions by uploading a supported text transcript or timed subtitles file. You can also provide a full transcript of the video and have YouTube time the subtitles automatically, type the subtitles or translation as you watch the video, or hire a professional to translate or transcribe your video.           
“If you want your video to be watched, it needs to create some kind of value for the viewer. Videos that are purely focused on a brand, or driving sales, will likely be ignored. The best video content tells stories that connect with the viewer. The better you tell stories about yourself, the more likely your viewers are going to understand what your company is offering and what it can do for them.” – Ash Read, 7 Secrets of Super-Successful Video Marketing, Buffer; Twitter: @buffer
Sharing your videos on social is an easy way to add additional insights to your video and engage with viewers. YouTube makes it incredibly simple for you and others to promote your video across other social networks. To share a video, just click the “Share” tab underneath the video. There you can select where to market the video. YouTube even provides a shortened URL to your video for convenient sharing. 
The power of YouTube's ad-targeting abilities -- enabled by both its own user data and outside data it can get with Google's help -- have also helped its cause. So have its investments in building quality measurement tools that help companies gauge the impact of a video ad on things like awareness of a product and attitudes towards the brand that's selling it.

In re: your second point, getting users to pay for content is absolutely part of the equation, but not the entire equation. The whole other half of it is creating ways to minimize the cut a middleman takes such that even if it’s zero sum game, more of the sum is going to the content creators, as well as developing new revenue streams that don’t require a direct cost from users to give direct profit to content creators.

Before you can start getting paid, you'll need to reach the payment threshold. This varies depending on your currency. In the US, the payment threshold is $100. This means you'll need to earn $100 before you can start collecting any money. If you've hit your payment threshold, you'll be paid around the 21st of every month. If you didn't meet the threshold, that money will be rolled over into next month's amount.
21. Focus on stories instead of sales. “Before the rise of social media, if you wanted someone to see an advert, you had to rent space within a popular media channel like TV or print. On social platforms, brands can reach the exact same audience directly. This means that branded content (advertising) competes with entertainment, rather than interrupting it.
The money you earn on YouTube is entirely dependant upon how many views your videos receive. If you have a large number of subscribers and all of your videos receive thousands of views, the ad revenue will be high. If your videos have a low number of views, those videos will not generate much in terms of revenue. “Gangnam Style,” for example, was a viral hit that received over two billion views and generated as much as $5.9 million in revenue. However, even popular users generally see views in the thousands rather than the billions, so earnings are considerably lower on average. As of 2013, it is estimated that one video with a million views can earn the creator between $800 and $8,000.
37. Add a shareable element in your video. “Now, this is extremely important and useful. If you’re seeking large and diverse traffic on your videos, you must create videos that are shareable. You can try and make your videos entertaining, educational or catchy. Viewers are more likely to share videos with these characteristics with their friends and family.” – Best Ways to Promote YouTube Videos for Higher Traffic, Times Square Chronicles; Twitter: @T2Conline
Plus, the money you’ll make as a result of these monetization options isn’t exactly going to be sending you into early retirement. You might make something like $1 per 1,000 views, and you can’t even get paid until you hit the $100 mark. For most businesses, this takes ages. Many find that it’s not worth the risk of losing viewers for pennies of potential profit.
One of the main ways you can take advantage of this feature is by creating a channel trailer. A channel trailer is the video version of your description and is shown to all your unsubscribed viewers. Your trailer should be short and sweet (around 30 to 60 seconds). Focus on showing visitors what your channel is about, what they can expect to see, and encourage them to subscribe. Your trailer won’t be interrupted by ads, keeping the user focused on why they should watch more videos from your brand.
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