I invested a lot of money into bitcoin. Then I lost it.

Just one datapoint. But there's no question that bitcoin is extremely dangerous to anyone who buys it. You can lose your private keys. You can have your coins stolen. You can put your trust into the wrong web service.

One thing I've realized is that bitcoin is mostly about greed right now. There's no reason to buy it unless you want something that can only be procured via bitcoin, or unless you want to make a lot of money. But unless you're very lucky, you won't make a lot of money. You'll probably lose money.

I would agree with Buffet. Unless someone comes up with a compelling reason to buy bitcoin, then don't.