Good discussion William.
I think the purpose of determining of cost of hosting data on blockchain is to determine what’s the lowest possible price for the storage rent. In that sense, I am not quite sure Opportunity cost and learning curve cost affect much in determining the price of storage rent.
To me, opportunity cost is used when deciding “what to do” at the moment, but it shouldn’t be accounted for in determining the price of something I offer over the time. For example, if I have a lambo and I use it to deliver food. The opportunity cost of using my lambo to deliver food is extremely high (when you can rent it out for thousands of dollars per day), but I can’t price the food delivery so high because of my opportunity cost.
Similarly, learning curve cost seems “sunk cost” to me, which shouldn’t be the cost/price determinator over the long term. Over the long term, the key determinator is still the cost of “state storage” itself.