Plus (Tier 1) gives you the following:
Every month:
* 4 Blacksmith Coins (~$7 in value)
* 115 Crystals (~$4.60 in value)
Passive perks:
* 10% off everything in the store
* +20% AFK Crystals
* 1.5x Mines Crystals & Money cashout
* 1.2x Opal Pieces from the mines