Another way to get income is to do sponsored videos. A site that makes this really easy is Famebit. They find the sponsors and categorize them so all you have to do is look for ones you are interested in and apply. They even give a suggested price range. You could make from $100 to thousands of dollars depending on the size of your following.
Sponsored videos can be mixed in with your usual videos and the extra income can help you share your passion online full time! They should obviously make sense to your viewers and not be done just for money but to help them discover new relevant products and services.