If you are selling products or services where the variable cost is close to zero then free or freemium is an option. Some people will always have the incentive

If you are selling products or services where the variable cost is close to zero then free or freemium is an option. Some people will always have the incentive to go free and it makes perfect sense for them. Google and Facebook would be little niche companies if they had charged users for their services: "Buy 100 searches for 3 dollars". Personally, I would have settled for Altavista.