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They don't just collect ETH though they tend to raise BTC. Only the ones that fail would eventually burn through everything they raised which isn't necessarily ETH. You aren't accounting for successes that will need to buy more ETH.

Investing is risky and there will be failures but there will be successes too and those major successes should more than cover the cost of the failures.

Kik messenger has announced they are going to create a currency on the ETH blockchain called Kin. They aren't going to have to burn through ETH holdings to keep the lights on either.

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