Metering is great for defined processes. I love AWS because I can align cost with business. In the old days it was often hard and an internal political process. Some saleschick would shake the assets at a director and now I’m eating the cost for some network gear i don’t need.

But for users, that fine grained cost is not good, because you’re forcing a user to be accountable with metrics that aren’t tied to their productivity. When I was an intern in the 90s, I was at a company that required approval to make long distance phone calls. Some bureaucrat would assess whether my 20 minute phone call was justified and could charge me if my monthly expense was over some limit. Not fun.

Flat rate is the way to go for user ai, until you understand the value in the business and the providers start looking for margin. If I make a $40/hr analyst 20% more productive, that’s worth $16k of value - the $200/mo ChatGPT Pro is a steal.