Of course, but Helium - any isotope - is quite rare and our supply strictly[1] decreases with time. In fact, both (very useful) isotopes are rare for different

Of course, but Helium - any isotope - is quite rare and our supply strictly[1] decreases with time. In fact, both (very useful) isotopes are rare for different reasons. He3 got expensive - enough to seriously impact medical and scientific uses - when we decided a beta-detector was needed across in port. (He4 we just waste in party balloons sigh) [1] well, almost. Capturing alpha particles works, but good luck filling the LHC or your local MRI scanner from a source that expensive.