"hyperbolic price increases"
When the "market" determined that a $4 cup of coffee could actually be enthusiastically adopted when the "norm" was 99 cents -- with free refills, it may have been a good example of a game changer? It might be interesting to take a granular approach and determine how consumers prioritized the elements of that $4 cup of coffee at the time: "the coffee"- 99 cents, "being actively involved in the coffee culture"-99 cents, "looking good while I’m drinking coffee"-99 cents, "an affluent, unique experience"- 99 cents, "free wifi" - 4 cents?
Now take those numbers and project a straight line out to 100,000 times that investment ($400k) while removing the word "coffee". Is there some level of consistency in the motiviators?