That's not to say we should not build a observatory there - this is a good idea[0]. But it does not solve most of the issues these satellites pose.
[0] Though a space station might solve a lot of similar issues without the need to land and take off.
How much ? Surely having only 1 or 2 would require a planetary consensus, so let's say every country can have one or 2 ?
Or simpler, let's everyone who has enough money to do it ! Yay !
Coming In : "how we came to pollute the far side of the moon"
(Potential repliers please ponder the difference between "easier to deal with" and "trivial".)
Space should be open for all - nobody should be able to restrict vision. I won't be surprised if we have to use weaponry to remove these satellites in the future. Space boundaries will be a hot topic in the future.
Do you have any numbers? I don't, but in my country of 11 million people, the dictatorship got scared last week of popular protests and cut out the Internet for everybody. How I wish they didn't have that power.