> I think you're confused.
How delightfully condescending of you. Yes, I didn't realize that the 5% number came from you, that hardly makes me "confused". Taking that into light, it's not obvious to me how a very rough back of the envelop projection is significantly more ridiculous than a number pulled out of thin air. My whole problem is that you called it ridiculous when it was clearly meant to be a rough order of magnitude projection. You can't really criticize a number pulled out of the air, because it goes without any attempt at justification. But a back of the envelop calculation can be improved in a piece-wise fashion to hone in on a better result. So any attempt to model a phenomenon (as long as it doesn't come with unjustified claims of precision and certainty) is an improvement over a number pulled out of the air. But that process is short circuited when people just dismiss the projection out of hand as you did. This is why I appealed for an improvement in my first comment. It's really easy to shit on someone else's effort, but it is completely unproductive. If you see a problem, then fix it. Then you're adding to the conversation, rather than just shitting on a little bit of effort someone put out there.