mate that's called the profit motive. if it costs 30 dollars to make something and you sell it for 'more than it's worth' at say 40 bucks, thats called your profit margin, how much money you make. if you only sold things for their worth, there would be no capitalism, just bartering like back in the old days. not too mention licensing would add more to that 30 bucks, narrowing the profit margin further.