Once.
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Nothing will happen if you keep installing and uninstalling Minecraft. Minecraft does not track how many times you have installed it nor does track how many computers you have it installed on. The only drawback is if you uninstall Minecraft by deleting the .minecraft folder you will lose all of your saved worlds on that computer.
No
Minecraft is a onetime Purchase not every game is a pay to play...pay to play meaning you pay per month to play.
You can pay for minecraft in any currency: it automatically converts. In pounds sterling it is around £13.
No, you only have to pay to upgrade to premium.