General

A Merch's Saying I'm just wondering about the most common way to make money. That's to "buy low, sell high". I'm not sure why this is a successfull way of making money. Let's say you buy a gfa 60% for 10mill, the normal price is 13mill. Now you wanna re-sell it for 15mill. Why would some one want to buy it when other people sell it for the normal price? We are all merchs and we should all know the prices for every item, so can anyone tell me how this method of making money works out? Thnx.