When YouTube first came out, most people only used it to put up interesting or funny clips. To this day, the primary use of YouTube is for watching random content that ranges from serious to outright inane. For marketers, YouTube can be a very valuable resource for making money or increasing the strength of your business.
Technically, you do not even need a business to make money with YouTube. They have recently started offering a revenue sharing service that pays you based on the number of views that your videos get. Therefore, if you can simply be entertaining enough, there may be a future for you. However, you truly need millions and millions of views to get any meaningful revenue via this route, so it is not a preferred method for utilizing YouTube.
The best thing you can use YouTube for is to promote your website. You can also host any videos that you put on YouTube on your site as well, increasing the amount of content that you offer. To be successful, you have to produce videos that are meaningful in some way, so that means offering informative content or having some level of entertainment value. People are not just going to listen to you simply because you managed to get a video on YouTube; it has to be good, or people will click on to the next video in a flash.
If you manage to create a viral video (which means it spreads rapidly by word of mouth), you can get hundreds of thousands of hits to your website. It is difficult to create something that is truly viral, but if you possess a godly amount of creativity, something may come to you.