It's economical to capture and sell the Helium out of natural gas even without a flaring penalty to encourage to be efficient with heat and material outputs.

It's also already economical to make Hydrogen and Carbon-based products like Graphene and spec Oxidized Carbon Nanotubes from natural gas.

https://news.ycombinator.com/item?id=48946629

And, it's surely also profitable to make more He3, He4, and T with a fusion reactor: https://news.ycombinator.com/item?id=48946533