I noticed that my piggy bank has a number and some extra coating. I hit the information button and it only tells me how to earn bars, but doesn't explain why the piggy bank "levels" up or what it will do. My current option is to buy 2.99 to collect 30 gold bars and shows that my next pig will be #5. Please explain the new piggy bank? As you can tell, I bought 4 piggy banks, each for 30 gold bars but nothing new or no sort of upgrade, etc.