Could do roughly what most domain name registries do: you can renew for between one and ten years at a time. So if you wanted to pay for years 11–20 all at once, you’d just cough up your $1,133.30 in one go rather than paying it annually as $10, $15, $22.50, …, $384.43.

I honestly never thought I'd see someone citing the ICANN DNS system as an example of a good thing but in this case I agree, it fits.

It's an interesting point. Yearly is terrible for individuals but if you think about it for a tax such as this large blocks are just paying for the smaller pieces all at once. It probably doesn't make sense to offer discounts since the express purpose is to discourage holding the copyright in the first place.