Plus (Tier 2) gives you the following:
Every month:
* 8 Blacksmith Coins (~$14.50 in value)
* 240 Crystals (~$9.60 in value)
Passive perks:
* 12% off everything in the store
* +40% AFK Crystals
* 1.8x Mines Crystals & Money cashout
* 1.4x Opal Pieces from the mines