Plus (Tier 3) gives you the following:
Every month:
* 15 Blacksmith Coins (~$24.30 in value)
* 400 Crystals (~$16 in value)
Passive perks:
* 15% off everything in the store
* +60% AFK Crystals
* 2.2x Mines Crystals & Money cashout
* 1.6x Opal Pieces from the mines