Club's Piggy Bank

Pay for your Coupon.
Each Coupon has a unique ID number that is generated at random.
Each Coupon is valid until the Piggy Bank raffle is over.
Once a month, an interim Grant raffle takes place.
After the Piggy Bank gets full, which may take several months, holders of 50 Coupons will receive $10,000,000 in Grants for each Coupon they own.
Winners’ Coupon IDs are determined at random.

You can use this calculator to count the probability of winning various lotteries around the world.