VIP Rank grants you the following:

• VIP Title in-game
• Remote /trash command
• Vault size increase to 7 (get +6 x 54 slot player vaults)
• Remote /wb (workbench) command
• Up to 4 Auction House listings

You also get the VIP Kit every 24 hours which gives:

VIP+ Rank grants you the following:

• VIP+ Title ingame
• Remote /enderchest command
• Vault size increase to 10
• Access to remote /sell command
• Access to remote /grind command
• Up to 6 Auction House listings

You also get the VIP+ Kit every 24 hours which gives:

And all previous rank perks.

MVP Rank grants the following perks

• MVP Title ingame
• Vault size increase to 14
• Toggle permanent /nightvision
• Daily /shout limit of 1
• Access to /autogrind command, for automatic grinding of items you receive.
• Up to 10 Auction House listings

You also get the MVP Kit every 24 hours which gives:

And all previous rank perks.

MVP+ Rank grants the following perks

• Vault size increase to 21
• Daily /shout limit of 3
• Grind bonus of 200% - Earn 200% Gold when you grind items.
• Access to /challengecheck command that checks all your /vault for items for current Challenge Buy Orders at the Challenge Master.
• Automatic ChallengeCheck for new Buy Orders, toggled by /autochallenge command.
• Up to 18 Auction House listings

You also get the MVP+ Kit every 24 hours which gives:

And all previous rank perks.

ELITE grants you the following perks

• ELITE Title in-game
• Vault size increase to 28
• Daily /shout limit of 5
• Grind bonus of 500% - Earn 500% Gold when you grind items.
• Unique title when joining
• Unique message when joining
• Unique sound when joining
• Up to 30 Auction House listings

You also get the ELITE Kit every 24 hours which gives:

And all previous rank perks.