Most gamified platforms make the same mistake: one currency, doing two jobs. Progression and spending pull in different directions, and when you conflate them, both suffer.
BLUERABBIT splits the two on purpose. XP is your progression signal - it only goes up, and it's what levels you. BLOO is spendable currency - it goes up and down, and it's what you trade for items, unlocks, and shortcuts. Keeping them separate means players always have a clean answer to "how am I doing" (XP) and a separate, guilt-free answer to "what can I do right now" (BLOO).