From the site, because they put it so well: "It eats! It Oinks! It doesn't wear pants! This is one hungry piggy bank. Feed it a coin and watch as it devours the entire thing! Saving your money was never so easy and funny! Old school piggy banks are so passe!"
Keeping an unwrapped chocolate bar is risky and overall a very bad move. But a fabric candy bar that holds your money without making it sticky is pretty genius, I must say.