[iDB does not condone app piracy.]
Have you ever been inside a peddler's mall? It's basically a huge consignment shop where different vendors come and sell their knick knacks under one roof.
People who have items to sell in a peddler's mall pay the mall's owner a percentage of their sales for the rights to sell in the store. People will come to the peddler's mall to see what kind of deals they can find and to barter with the sellers.
In a way, the peddler's mall is a lot like the App Store. And folks, people are shoplifting.