Nothing you just wrote contradicts what you quoted. "They may sell a subset of their product" ... this doesn't say anything about the amount of revenue associated with "the subset". The idea is that they sell part of their line to yuppies (and whoever else wants to wear them while still within proximity to more than 5 other people) and sell a different part of their line to people who actually get out there. Yes, the revenue from the first case may greatly exceed the revenue from the second case, but that doesn't invalidate the point.