I am currently working on WVR (lvl33) and so far i can't see how people say it is costly to level. Granted, i am using BOT to gather up my mats but all I have done is go from moko grass > cotton bolls > diremite webs > flax.
The webs i had to farm with my 50 SCH. but honestly, at least on the Hyperion server, these are hardly ever camped entirely. 1 of the 3 good spawn spots is always open in north shroud.
It becomes really expensive after linen (~lvl 35). You almost have to use linen 3x leves to craft 35-50 because the next step up is wool. Wool is made from fleece. There is one area in the game that drops fleece, and only about 7-10 enemies in that area that spawn. And the drop is pretty uncommon (you get skin, meat, and fleece from the mobs, and the drop rate feels like 25%). But one more complication, there are 48 other farmers waiting on the spawn. And you dont get the item unless you get first tag. So bring your blm.
On Ultros, fleece is 600-700 gil a piece. You need two to make one wool thread, which sells for 2k-2.5k on Ultros. On the other hand, Flax is 3500-4k a stack of 99. So it is much cheaper to level with linen, but will still break you if you aren't BOT. But I got WVR to level 50 without a single level in BOT. It can be done, but that is why ppl say it is expensive. Edited, Oct 3rd 2013 11:02am by Valkayree