@rupertc $500 will not become a few hundred thousand for almost any company (maybe early Amazon or Google) unless you buy in at less than $1.00 per share and it does very well.
I bought some EnergyX when it was at $4, understanding that it could all be lost. An awesome exit from my PoV would be $40 to $80 (I e. 10x to 20x). $20 to $30 would be great.
Rio Tinto is a large, multinational, 100+ year old mining company that trades around $60 to $75. EnergyX is a tech company (room for high multiples), but it is related to a subset of the mining industry (reduces odds of high multiples).
I'm certainly not going to be upset if EnergyX went up to $200, but I would probably have sold most / all of my position long before then. They will likely need to come up with multiple, popular, economically valuable products to have a chance at getting to the $200 range.