I think PVE only servers are a terrible idea.
Ive made that clear in many posts.
However ive never really noticed many guilds in SOT.
Guilds really build strong community more than any friends list could ever do.
It would be nice to have a Guild Server where you can sail with and train with your guild but there is no progression or gold possible to earn.
There will also be a server where guilds can be matched with other guilds to fight. There could be monthly tournaments with a leaderboard with exclusive cosmetics for the ranked 1 guild.
These cosmetics are a trophy meaning they will be lost if the guild gets dethroned.
