If you suppose that BTC would be a widely adopted currency, you wouldn't "sell" it, you would simply exchange it for the good or service. But in this case if BT

If you suppose that BTC would be a widely adopted currency, you wouldn't "sell" it, you would simply exchange it for the good or service. But in this case if BTC is deflationary you would still hesitate to spend it. USD is inflationary, so there is hypothetically a small pressure to use it.