I was told of the same form of recipe at the woodworking guild for Maple Lumber as well.
Wind Crystal x1 Lumberjack Bundling Twine x1 Maple Log x 3
I had a whopping Woodworking skill of 4 at the time.
On a side note, I'm curious to see what impact this has on the cost of crystals. Less demand should lower the price. Of course, the influx of the Europeans should also increase the supply as well, further lowering the price. "Buy now and save!" While it's probably not so beneficial to those trying to build a bank account selling their crystals, it may make crafting more feasible at lower levels. *shrugs*
i have tested this out and to process 2 extra logs for only 40gil and not 2 crystals this will save time. i have 72 wood and have made many hq items just my opinion
what it does is it allows you to mass produce lumber from logs. 3 logs + twine + wind crystal= 3 lumber. you pay about 100g for twine, and only have to use 12 crystals to make 36 lumber.
while fiddling around i did 3 arrowwood logs, and with skills at 65 was able to HQ 1 time on windsday yielding 6 lumber.