Cause at their website it says the profit depends on the revenue of the posts Bubblews is making.
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Having done some research, it appears Bubblews is not worthwhile. They will credit you with money but they will not pay - based on a couple dozen reviews that I've read. If anybody has had great success with it, feel free to chime in.
Reading, liking and commenting on other people's posts will get you more page views from other Bubblews members, but you should also aim to get search engine traffic by writing informative SEO content. Sharing your posts in social media networks should help too.I realized everytime someone view my post I make get paid 1 cent. Who knows any technique or skill to make more money on bubblews.