Actually, it is VERY realistic and EXTREMELY common.Then we should focus on industries that have less price sensitivity and can appeal to a target market through differentation.
It's not realistic to expect black people to pay significantly more for the same service/goods that they can get from a major corporation.
Clothing, restaurants, entertainment, are less price sensitive and those industries we can grow in without huge amounts of capital. Even niche markets related to high end goods and services, are areas we can penetrate. But generic mass market goods and services, we aren't going to compete unless we do a fierce job of obtaining capital.
What we can also do is be better at creating our own VC, Private Equity, angel investor groups that can fund these type of businesses to put in them in position to be competitive in the market.
Black people significantly more to these Korean and Indian shop owners for things that could be getting cheaper elsewhere.