Why the Pig is meant for wealth?

I have never really considered that question, and it's an interesting one. I know that I have seen kids banks in all kinds of different shapes. Maybe once a long time ago someone had a pig shaped bank, called it "Piggy" and it stuck?

its because it looks funny

Because as a pig you no need to works but can always have foods for you:)

Very interesting topic. I thought and thought about it. May be because, we refer pigs as greedy, and sometimes we collect because we get greedy, so may be this idea came across somebody's mind when he's looking at pigs who eat very greadily. I dont know this is what i think.

due to its stomach

Great question! So, I thought I would research. Here are the results: From http://www.ideafinder.com/features/everwonder/won-pigbank.htm "So why do we save our coins in a piggy bank? Because someone made a mistake. During The Middle Ages, in about the fifteenth century, metal was expensive and seldom used for household wares. Instead, dishes and pots were made of an economical clay called pygg. Whenever housewives could save an extra coin, they dropped it into one of their clay jars.They called this their pygg bank or their piggy bank. Over the next two hundred to three hundred years, people forgot that "pygg" referred to the earthenware material. In the nineteenth century when English potters received requests for piggy banks, they produced banks shaped like a pig. Of course, the pigs appealed to the customers and delighted the children."