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Sure it might be a few more bytes and Satoshis add up but 5 bucks is a lot. The donations point is a bit weird: "ah it's just other peoples money, give as much to the miners as possible".

pot of gold or a bag of clowns, that's not money anyone cares about

Clearly, because they sent it to the pot of gold.
I really don't understand why anyone would want to send anything more than the minimum into the pot. You only stand to lose.