Use It or Lose It: Implementing Usage-Based Pricing (Part 2) (rosslazer.com)

I like how this aligns vendor needs with customer needs. If I use more of it, it means I'm getting more value out of it.

Meanwhile, an Oracle sales person would love for you to sign a yearly contract, then ignore the license until it's time for the next renewal.

(This is also how Amazon and Azure beats out HP and Dell.)