@Little Mouse. The present supply should not matter, however inflation should. Grin will have an inflation rate of over 10% for the next 10 years, over 5% for the next 25 years.
Compare that to dogecoin's price pattern which presently has a 4.45% yearly inflation and you might not like what you see.
That pattern looks like a real downer, right. On such a high inflation they are more sort of a collectible for enthusiast.
Might be the right coin for GPU mining on the other hand just today.