One of the biggest complaints I hear about video is that it’s so time consuming.  It takes forever just to make one video. We’ve found a solution.  We call it the, “Massive Video Production Strategy”  This allows you to make the most amount of videos in the least amount of time and work.  By using this strategy, some of our clients were able to shoot, edit, upload and optimize 30 videos in 9 hours.
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.
But sponsorships are where the big bucks are made, and where intermediaries like MediaKix and other agencies come in. This is the major leagues: Most brands aren’t interested in YouTube channels with fewer than 200,000 to 300,000 subscribers or average views of less than 10,000 to 20,000 per video, says Asano. The bar is also high because videos cost more to make, and require tricky negotiations —the sponsor will want to know where their product will be featured, for how long, and so forth. “When we’re connecting top brands with top influencers on YouTube, you’re talking a minimum budget of $50,000 to $100,000, and it just goes up from there,” Asano explains. “Some of the biggest YouTube influencers get paid $100,000 to 200,000 for a single video. And then those videos get millions of views. That’s why there’s a lot of money in the space.”
In February 2015, YouTube released a secondary mobile app known as YouTube Kids. The app is designed to provide an experience optimized for children. It features a simplified user interface, curated selections of channels featuring age-appropriate content, and parental control features.[60] Later on August 26, 2015, YouTube launched YouTube Gaming—a video gaming-oriented vertical and app for videos and live streaming, intended to compete with the Twitch.[61]
But what about the cost of servers, bandwith etc? I think it might be in the range of  $750 million per year to as high as $1.5 Bn plus ( we will never know as Google never reveals cost of running youtube, and Google has invested heavily in this space ). I feel Youtube as a standalone business  MAY NOT be as profitable a biz as Search and might never be since barely 10% of its content is actually monetizable. But for Google, with $30 Billion revenues, Youtube losses( even if money lost is as high as say $500 million per year) is chump change considering the strategic advantage it gives visavis competition. (Microsoft online businesses lost way more last 10 years). Youtube subsidy by Google has created a monopoly which has effectively destroyed all independent video ad network business plans.
Typically only offered to large YouTube channels with a wide audience (although not exclusively), another big way to earn cash through YouTube is to get sponsored deals with companies that will pay you to promote or mention their products in your videos. You can earn money this way either as a lump sum of cash the company will pay you for the deal, clicks on the company's link, or on a per-view basis. 
YouTube was founded by Chad Hurley, Steve Chen, and Jawed Karim, who were all early employees of PayPal.[6] Hurley had studied design at Indiana University of Pennsylvania, and Chen and Karim studied computer science together at the University of Illinois at Urbana-Champaign.[7] According to a story that has often been repeated in the media, Hurley and Chen developed the idea for YouTube during the early months of 2005, after they had experienced difficulty sharing videos that had been shot at a dinner party at Chen's apartment in San Francisco. Karim did not attend the party and denied that it had occurred, but Chen commented that the idea that YouTube was founded after a dinner party "was probably very strengthened by marketing ideas around creating a story that was very digestible".[8]