As of Season 8, all items and blocks are accessible to all or disabled by order of the Lag police.
Ranks can be bought permanently through the FunSquareGames site (see Server Store link in the menu bar). Remember to register on the other site to get access to the shop.
Ranks includes periodic kits, more homes, and commands (yes, you can get /fly).
Check the shop for further details or type /buy in-game.