2. Even today, as long as there is enough of a market that will be satisfied by you discriminating, the "invisible hand" won't actually work.  For instance, let's take a look at this exact situation, but with Sweet Cakes by Melissa.  They were able to raise over $500,000 in the course of about 2 weeks in donations because they discriminated against gay people.  Again, the "invisible hand" of the marketplace didn't really work there either.