The best case scenario for Bitcoin is reaching a consistent price for the rest of its lifetime. That scenario means there's no reason to "invest" in it because ideally it would never change in value.

Only people trying to cash out need people buying in. If you were really invested in the long term you'd rather people not buy in so you can buy more at a lower price.

Bitcoin also has fees. The only reason the fees are lower than credit cards are because people in China can afford to burn electricity at a loss just to turn their Chinese money into anything else.

You still have to pay taxes on the capital gains. And you can't pay taxes in Bitcoin.