These are the same people. The price depends on only 1 thing. Do people sell.
It can be assumed that it is pointless to sell something that you then have to buy back to use. Ie you will only sell what you don’t need.
And the question is, how much Safecoin does my Tesla need for 1 year to run autonomously and SAFE? 
The moment my vault is 100% full and I stop receiving new money, I will delete it and let my other vault farm in other SAFE network. At the same time, I will launch a new vault in the first SAFE network, waiting in line to enter. How likely do you think this is to work this way? Are there any disadvantages for me as a farmer to do this?