I comment in Spanish from time to time and have done very good at times on that language. We post because we want to and if we make money that's an extra. You can also earn rewards by using the site, voting on content that you think it's good for the site can give you rewards.

When you post in another language there may not be as many people voting on it because there are less users that can undestand. The solution for this is to bring in more users from the language you are best writing in to be more sucessful in reaching voters.