What services and benefits could citizens of a contractual government gain, while excluding non-citizens?
Contractual government = Citizen signs an agreement which specifies a) what authority is granted to the government and b) how to break the agreement.
Or perhaps we should name it the liberty union. And charge dues.
Non-citizens could be excluded from some benefits. Would such an organization ever deliver a non-excludable good, delivering it also to cheapskate crackpots free-riders?
What can we do about free riders when coercion is not an option?