Here's the reason we get those red pigs in our planners. The PD shop. When you can exchange your pig stamps for whatever is being sold.
They've taken this concept of rewards for getting rewards for doing good stuff and taken it to their own level. But what's it like? What does it sell? Why do you even care?
Walking into M4 - the classroom that becomes a PD store after Period 5 - you get a sense that it's all been FUBAR (a military acronym - if you don't know what it means, Google it). There's children lined up behind tables waving their planners around. Some people have just one pig, others have stupidly high amounts. Occasionally, they will be offered the chance to buy something. For one stamp, you can get three pens or pencils. Two stamps gets you a bit more, or possibly a maths kit. Remember: pigs mean prizes. Or something.
The other selling point is the raffle. Buy a ticket and be entered into the draw. For an iPod Shuffle. We've heard that the school has only procured this iPod because they didn't give it out in a past competition as a prize, even though they were supposed to.
The PD Shop is, as far as we know, currently closed until some later point in the year, when it will be open for "business" once again...