i have done the world 16 crafting thing, its pretty good for exp, faster than running anywhere yourself, including laws. 100k is about 1000 ess, so you would really only try and breakeven when you can craft at least 6, considering the downward prices of airs. However if you can keep at it until you can craft 7 airs ea, at lv 66 crafting, then you breakeven, if not almost (if you buy ess 20ea, you pay 1 gp per 1 xp, very cheap).