If you offer 20% on 6 months, and i park for 6 months then just hold the money in my wallet for 6 months, it’s the same as if i parked for 1 year at 10%. Whether someone is holding their nbt in their wallet or parking it, you cannot make a person sell their nbt. So if you pay a certain total sum of money through a particular time interval, it doesn’t matter if it was a lot for a short period and then nothing or a little for a long period if the total cost and time was the same.
I’m not doing an experiment, I’m stating economic facts about our network. If we were selling new products we wouldn’t need park rates. To me suggesting we sell nubits as a solution to increasing park rates is like telling an infirmed patient that the best way to feel better is to get well.