I guess I just mean a bitcoin exchange.

A place to buy money dosen't make sense. Without fiat bitcoin dosen't have a price and a place to buy them.

You have people selling tomatoes for money. You don't have a place where people go to buy money in exchanges of tomatoes.

The point of money is to solve the coincidence of want. There is no place that accepts everything in exchange of money.

You have markets. Markets of goods. Not of money.

Does that make sense? I'm rambling now.

Buying money is fiat.