It sounds like you're missing the point. It's not about creating a top-down libertopia to prove that a "libertarian society" can work. It's a matter of facilitating technology such that many such little jurisdictions can spring up, and individuals can easily move between them.
> such little jurisdictions can spring up, and individuals can easily move between them
Unless you are capable of defending your country from a serious (read: US or NATO) invasion force, you are merely playing at sovereignty. You will be free to do what you like as long as it does not seriously upset established regimes. In that case, what is the point of starting a new country?
But they still get along fine and carve out their own niche, as long as they don't step on the big boy's toes.
Facilitating drug smuggling is likely to get your seastead stomped out. But there are many activities that won't upset established regimes, while still allowing more freedom for your residents (and flags of convenience might give you even more of a deterrent). Whether a seastead could be a wealth producer through tech industry or would simply remain a drug-vacation destination remains to be seen.
