"Here's this great new crafting material....oh and by the way it's not worth using for your crafting professions."
My tailor makes extra cloth with his. I sell a few bags and make sure my alts are getting the biggest bags. Sounds like a crafting use to me.
I'm currently sitting on 155 Imperial silk as it is without using the spirits, not to mention if I'm using them to make cloth for bags I'm wasting gold. I'd be much better off trading them in for Golden Lotus, selling the GL and then buying the bags off our AH.
It Takes 36 SoH and 300 windwool cloth to make 12 imperial silk. If one completely ignores the cloth you get:
36 SoH = 72 Golden Lotus
Golden lotus currently sells for approximately 60-75g each on this server (the mean according to Undermine Journal is actually 89g)
72 GL = ~ 4500g
Royal Satchels sell here for an average ~3500g each.
I'd be wasting over 1000g per bag.
On this server, the only crafting item that has ever come close to being worth using SoH to make cloth for is the leg enchants, and even that has never been better than break even.
Since my best option is and has almost always been to trade them in for Golden Lotus to sell, they have never been a benefit to this character despite having 2 non-gathering professions. I can do the same thing with any character regardless of profession.