It is a time taking job and needs too much effort to create a successful list on amazon. Consider after creating a list someone comes on your list and starts selling their own product as yours. This process is called Hijacking a list. There are some ways you can use to prevent your listing from hijacking.
Negative feedback also decreases the chances to win Buybox at Amazon. Sometimes Amazon blocks or suspends your account if there are a number of negative feedbacks.
Amazon is now the most popular multi vendor ecommerce platform across the world. Everyone is searching about how to sell on Amazon. If you are planning to start an ecommerce business or grow your business globally, You should immediately start with amazon.