Amazon FBA sellers fail because they ignore the full cost structure. Between selling fees, fulfillment fees, advertising, storage, and shipping to warehouses, your actual profit margin is far smaller than revenue suggests. If you don't track every expense precisely, you'll scale a losing business without knowing it.
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You will never be successful on Amazon FBA if you don't understand numbers, because especially expenses, right? 15% selling fees on Amazon, 15% fulfillment fees roughly with Amazon. Then you have cost of goods sold. Then you have shipping to an Amazon warehouse. After that, you have advertising, storage costs. You might have to run coupons and other types of deals. As well. So this is why you have to know your numbers like the back of your hand when it comes to selling on Amazon, because if you don't, then you'll always be fascinated about that revenue figure going up and you will never know what you actually take home. And if you don't know what you actually take home, there is no pathway in order for you to go ahead and scale efficiently. You would just end up losing a shit ton of money on Amazon.