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The investing system is designed in a way that naturally incentivizes new investments. For example, a few weeks ago the commission rate was still pretty high (around 70%) partially because Bitcoin's price kept going up, which made it less appealing for investors.
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Maybe I'm misinterpreting your message but please be so kind to detail more the the bolded red part : how does bitcoin price affect commission rate (assuming it does as I'm understanding from the quoted part of your post)?