Am I correct in stating that there will be approximately 315 million GRIN after 10 years?
1 per second x 10 years?
If so the supply doesn't seem that high to me considering what the potential is for this coin to develop in the next ten years.
You're right. I also think the same - many people misunderstand. They think that Grin's monetary policy is stupid and irrational. Well, it is not. It has been designed this way on purpose. I personally think it's a good model and will play out nicely. Here's a nice chart that shows the Grin supply
https://docs.google.com/spreadsheets/d/1RO3zc5AvfN9rcVnrYnLjqCikFLHmD39_7MCV18lDrvc/edit#gid=0