At current prices and with 100 Service Nodes, things still look healthy:
My guess is that as nodes increase, the price will increase and so running a ServiceNode should, in theory, always be profitable?
I really like this idea of dynamic nodes tied to price (rather than a fixed number that increases with coin supply) so that running a servicenode will always be profitable, but there can be no guarantee that you will have enough spr to facilitate operating a node.
So using your price model, maximum nodes would currently be ~100. In order to guarantee the ability to run a node you would need coin supply/max nodes that would generate profitability or 45000 spr, but in all likelihood much less, lets say 25,000. In the event the price drops to half of what it is now, the amount required to operate a servicenode increases to 50,000 spr. This then drives those displaced by not having enough spr to buy more, increasing the value of spr and thus increasing the number of servicenodes available; creating a sort of equilibrium that generates organic growth of the servicenode network based on how successful the coin is in terms of market cap,
