Hey, someone knows how they works? The gain percentage.

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Just who the hell do you think I am!? 

This is the wrong forum to ask such a question. You should use a search engine and find the answers yourself. https://pages.ebay.com/rewards/faq.html

This would go under General Discussion if anything.

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Hey, parents! Here are all the answers to any questions about WBO Tournaments you might have! Thread-Guide-Hey-Parents-Answers-to-your-WBO-Tournament-questions

Please consult this guide linked below on how to arrive at tournaments before they start! https://worldbeyblade.org/Thread-How-to-arrive-at-tournaments-and-other-events-on-time