I am going to draw another ridicule about a topic again, but I thought about what "might" be a good idea. Notice how we have so many different $1 coins from 5 different series (Native American, Original 2000 Sacagawea dollar, SBA dollar and many different Presidential designs, and sometimes, we even encounter Ikes in circulation? Not to mention all of the quarter, penny and nickel series designs). So, I have thought, since they say that the $1 bill can never be redesigned, due to costs to small businesses and vending companies for upgrading machines that CAN be upgraded and scrapping and replacing those that can NOT be reprogrammed, why can we not have TWO different $1 bill designs circulating? The OLD design $1 bill for those who need to use $1 bills in vending machines, and a redesigned $1 bill for every redesign series that comes out? That way, the vending machines that CAN be upgraded, could be upgraded for new $1 bills, and for the few rare machines that can not be upgraded, people could just use the old style $1 bills. The only problem would be, making sure you have some old style $1 bills on hand if you were in that situation. Hey, if they can have tons of dollar coin designs from different series, as well as other coin denominations, I do not see any reason why we can not have a couple different $1 bill designs circulating, or at least, have the redesigned $1 bills made for collectors at a premium, and if you wanted to spend them, you could get BEP packaged redesigned $1 bills, same as Mint sewn bags of halves.
For the same reasons as the last twelve times you asked similar questions: 1. Creating coin designs is relatively cheap; creating currency designs is much more time-consuming and expensive. That's why the Mint makes lots of commemorative coins and the BEP doesn't make commemorative banknotes. 2. Vending machines recognize coins by their size, weight, &c., so they don't even notice coin design changes. But vending machines recognize currency by its design, so every new currency design requires a programming update. The number of vending machines that accept paper $1's is far larger than the number that accept larger-denomination paper, so a redesign of the $1 would cost vending-machine operators far more than the redesigns of the higher denominations. (Why am I still bothering to answer these questions? Because I have too much work to do this week, and I'm trying to avoid doing it.... )
Well, geeze, Numbers. You seem to be treating me like garbage, when I hailed YOU as a hero. Why...? Okay guys. No more posting, unless I hear of something different from what I have already said. You win.