QUOTE(aleden @ Aug 26 2018, 04:02)

Do the crystal perks really pay for themselves that quickly?
Well, yeah.
Let's say crystals are worth 3c each and hath 4k to make it easier.
Crystarium I is +100% Crystal drop and costs 250 Hath (1M), so to pay off you need to drop 2M credits worth of crystals, aka 666666 crystals, aka 55.5~ crystal packs
Crystarium I+II is +200% Crystal drop and costs 250+500 Hath (3M), so to pay off you need to drop 4.5M credits worth of crystals, aka 1500000 crystals, aka 125 crystal packs
Crystarium I+II+II is +400% Crystal drop and costs 250+500+1000 Hath (7M), so to pay off you need to drop 8.75M credits worth of crystals, aka 2916666 crystals, aka 243 crystal packs
Crystarium I+II+III+IV is +600% Crystal drop and costs 250+500+1000+2000 Hath (15M), so to pay off you need to drop 17.5M worth of crystals, aka 5833333 crystals, aka 486~ crystal packs
Crystarium I+II+III+IV+V is +900% Crystal drop and costs 250+500+1000+2000+4000 Hath (31M), so to pay off you need to drop 34.4M worth of crystals, aka 11481481 crystals, aka 956.79~ crystal packs
Not impossible numbers I'd say.
Paying back I and II is super easy, and III is quite fast too.