Conclusion: Grin is currently highly overvalued at $6.5
Question is not if price of Grin is over evaluated right now, but at what price and at what time will Grin found bottom. I believe most pessimistic date could be even 4 years form now and deep in 4 digits of satoshies.
I'm guessing more like 2 years and who know what BTC will be worth then so it is hard to judge what this will be worth in comparison.