re: How much should I invest in BTC today?

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It has zero utility besides speculative investment

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..other than you can buy stuff with it, maintain anonymity when using it, while enjoying no risk of it being seized by the government. For now, anyway.

If the fed centralizes it somehow - which would be a tall task - the value would go way down. If that doesn't happen, it will continue to grow in value. That's the gamble.