> - Buying things that people would be unwilling to sell to you with existing payment methods due to fraud risks. One legal example: iPhone purchases shipped to Nigeria.
Small global market share for legal uses.
> - Buying things electronically where the existing payment methods are too slow or expensive. For example, funding a stock trading account in seconds to an hour instead of 1-2 days or funding an online gambling account (legal for most non-US residents but slow and expensive with credit cards).
Most non-US residents can do bank transfers as fast as Bitcoin or will be able to Real Soon Now.
> - Buying an expensive item from a trusted merchant at a discount commensurate with the reduced transaction cost and zero chargeback risk.
So like 5%? Fringe, people who really care about a discount will buy something cheaper or haggle.
> - Paying for contractors or crowd-sourcing efforts in any country in the world with ease.
Fringe for consumer market share.