Even if you could... what happens when you get sick? Or you have a bad crop and need outside food? How are you going to get another nation to deal
with you? They won't be very willing because of the precedent it will set...
I think it would be a lot more trouble than it's worth. If you bought some land in the middle of no where, within an established country, would it
really be that restrictive if you're basically alone anyway? The cost of property tax would likely pale in comparison to the cost of managing your
own micronation.

