So $800 is for the governor package - this means at launch you will have a mayor/baron title a fancy house and a settlement to rule (along with some other bonuses like mounts and pets).
You will also get into the game three months earlier than everyone else so you can customise your settlement and gain some skills, money, equipment etc in somewhat peace before the majority of people enter the game (so that the world seems more lived in)
You will also have access to the alphas and betas. These are wiped since they're for bug/mechanic testing but you get early access (alpha is maybe early 2019 (maybe)) so you will have a greater understanding of game mechanics come launch. You do not gain or lose anything other than experience as a player (so you can't lose your title etc before launch)
When people join at launch they will all be on the same regional server (so if you're an NA-E guy you'll be on the NA-E server three months before launch for the exposition and people will join that server) and you would be a mayor/baron on that server.
Ofc post launch you can lose it all but you cannot lose anything in terms of 'being somebody' before the launch of the game.