I mean, anything new added in the server is and has been enough to generate motivation for people to try.
A randomizer for more valuable shells sounds great, lower chances of course.
About pirate's treasure, that sounds off for the server theme, not very "lore-friendly". The server has mentions to pirate stashes but i think everyone understands that as a hidden smuggler crate, not actual sea pirates. Would be a fun mini-mission tho.