Thereare several institutes that differ from your opinion on abundance and profitability. There is an estimated millions of tons of helium-3 in the lunar surface at just a few meters down and it's estimated that just 25 tons would suffice to fuel the US power consumption for a year, and 200 ton for global needs.
Regardless of helium-3, establishing the infrastructure will allow for other mining as well. Platinum and other rare earth metals. Whoever does it first is going to make a butt load of money.