[SunkenCiv]

In 20 years the US will have a permanent scientific presence on the Moon; also a number of US companies will have permanent facilities there, not least because they'll have to build stuff for the the permanent scientific presence; China, India, and probably Israel will also have at the very least put people there, even if they don't wind up building permanent facilities; I doubt that Russia will accomplish this, their plan for putting one cosmonaut on the Moon just long enough to plant the flag and take some photos never made it to feasibility, and they haven't improved with age.

The reason effects of long-term weightlessness was studied was to figure out what to do about in during long-duration missions, such as human missions to Mars.

Reasons:

1. Rare Earth metals are not so rare in space; tourist travel will also take place, and will become more commonplace after there's a destination, such as a Las Vegas on the lunar surface, and orbiting zero-G hotels.
2. It'll be fun to watch your head explode.

[PIF]

2. It’ll be fun to watch your head explode.

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I dibs the popcorn concession ...

[Sequoyah101]

I think you will have a very long wait.