Uranium is actually quite common; it's cheap because it's an extremely controlled market (who are you going to sell it to?) with fairly limited demand (it doesn't take that much uranium to run a power plant or make a nuke, a cube about a meter per side can run a reactor for a year). Because it's so cheap, it's not substantially prospected so there is a good chance there are large reserves that can be exploited if we go looking for them.

And, if it comes down to it, we can pull near-unlimited quantities from seawater at $200-1000 per kg (~10x current pricing). The costs of nuclear power generation are almost entirely capital costs and insurance, the fuel costs are practically a rounding error, so this does not substantially change the costs of nuclear power generation.

https://www.newsdeeply.com/oceans/articles/2018/06/28/the-nu...

So, uranium will probably never be super valuable. Strategically important, and nice to have in a conveniently accessible form, but not economically valuable.