Without talking about planned obsolescence -- when you buy anything on the cheap you should take into account the cost of manufacturing, the wages of the workers, the profit of the manufacturer, the costs of shipping, and the profit from the reseller. By the end of it you should have an idea of the quality of the shit you are getting.
Some people can never understand why a $1 cup of coffee is not the same as a $3 cup nor why a $15 coffee grinder is not the same as a $60 one