Just like a kit-shop offers to sell you items you may instead wish to work for items, in the Covenant you can not only work & earn you can gain wealth beyond your wildest dreams, for simple tasks you will earn Merits and with these you may choose to rank up within the group or to requisition items for your own use.
Any simple minded fool may earn a Basic Tier Requisition, these are simple items such as obsidian, fishing rods, beacons and survival kits. These can be earned by anyone Commoner rank and above.
Any more advanced member may earn from the generalised Tier 1 requisitions. These are useful items such as Ender Chests, Elytras, Rockets, Crystals, Totems. Everything an aspiring member of the PvP division may want. But for these are only the general rule you may earn bonuses or discounts for simple acts such as being a member of the Building Division or PvP Division. The items everyone wants.
For the civilised and more complex members, these items are perfect for your master builder, griefer or PvPer. You may choose from a number of items including a box of custom building materials, a custom PvP kit, Strength Potions, Wither Kits and TNT. For your specialised and sophisticated player, rank to this and you shall be rewarded.
The best spoils of membership, the highest ranked members can earn perhaps the best things, this does not include items but Priority Queue (Prio) and Utility Clients. For you have to spend no money on 2b2t to truly master it.