The Piggy Bank can be purchased for $10 US (plus applicable taxes), and there's currently no option to simply purchase it with City Cash, as that would defeat its purpose. If you decide to splurge on the bank, you'll receive 90 City Cash automatically, which is more than a $10 value anyway. After that, you can collect from the Piggy Bank once a day for a month and will receive three additional City Cash each time. If a month in this case is 30 days, then that's an additional 90 City Cash at the end of the promotion, giving you 180 in total.
Again, if you were to purchase City Cash outright, you'd only receive 83 for $10, so this is definitely a worthwhile investment if you already purchase City Cash on a regular basis. Is it a good enough deal to convert someone from a non-paying to a paying player? That I'm not so sure about, but if you're willing to splurge on the Piggy Bank, make sure you do so now before it's gone.
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What do you think of this Piggy Bank? Will you purchase one to double your investment? Sound off in the comments!