This is a customer group that would be really good for an online service.
For a physical retail store, items that are well liked by a 0.1% of population are a failure - since they carry much of the same fixed costs as a similar item liked by 40% of population, and extra variety costs them; and the best target audience of a physical retail store is "everyone who lives close enough" or "everyone of socal demographic X who lives close enough".
An online store can serve only that 0.1% audience based on their flavour preference. If there are a million people worldwide who really like Diet Crystal Pepsi? Great, there's a lot of money to be made on that product - even if it's unprofitable to stock it in Walmart and expect that a Diet Crystal Pepsi fan will wander in today.
For a physical retail store, items that are well liked by a 0.1% of population are a failure - since they carry much of the same fixed costs as a similar item liked by 40% of population, and extra variety costs them; and the best target audience of a physical retail store is "everyone who lives close enough" or "everyone of socal demographic X who lives close enough".
An online store can serve only that 0.1% audience based on their flavour preference. If there are a million people worldwide who really like Diet Crystal Pepsi? Great, there's a lot of money to be made on that product - even if it's unprofitable to stock it in Walmart and expect that a Diet Crystal Pepsi fan will wander in today.