Do you think it could be an issue with the majority of the whales being English speakers? I imagine non-English speakers will always find it difficult to get high rewards for content both in their home tongue and in broken English.
Ideally in my opinion, everybody would be able to create content in their own language, attracting others who speak their language, and still have the chance to be rewarded by a whale.
@serejandmyself and some others are working on a project that may help with this. You might want a look at his posts.