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Most businesses are broke because they only have one thing to sell. Car companies don’t just make money from selling cars, they make money from everything that comes after. Your business needs “spare parts” too. After a customer buys from you, what can they buy next? An upgrade? Maintenance? Support? Accessories? A premium version? If every customer can only buy from you once, you’re constantly chasing new customers instead of growing revenue from the ones who already trust you.