I had leveled botany first, and went for the luminary achievements, so I was drowning in lightning shards and flax. If you're an achievement hunter, doing your DoL's first will put you in a safer/cheaper position. Linen turn-ins slow down and crafting flax into yarn into cloth into pants is annoying as hell, but you need nearly a whole stack of fleece per woolen triple turn-in leve, and there's just as many small steps. You either pay a lot or you farm a lot.