Read thru the posts and will offer my input;
I Am on a low pop realm (which I believe makes it crap/harder lol)
Read that post about where someone sold the kits for 5k each with 4k of mats.
That would be ok if u bought from AH, popped a Jeeves, retrieved then advertised for sale.
But I noticed you went out to collect a couple of mats that u were short on?
For me, I believe that's wayyy to much of a mission for the return!
I tried at one stage 18 months ago using the same guild style idea that u mention.
Was with Alchemy and think I was asking for 6k
But I threw the idea away after having to deal with -
1. fools
2. Good people who had a few mats of their own
Or they just needed a few mats they were short of.
Which gave me a new idea that I tried;
I kept stock of the rarer herbs (mainly the rare ones from the popular levelling lists)
And I kept the AH mainly empty of them for a few days.
I would advertise my kit for sale price not stated.
As someone is enquiring about it and the price, I would reclear the AH,
Then jump on an alt and post those 2 or 3 herbs that they would need.
I would post a few stacks of each at 300-400 g
Funnily enough, it was fun for the few days I was lvling alch on an alt.
U could tell the people that would enquire whether or not u could get away with it and how much to charge. They enquire on main toons after seeing the advert after raiding in a decent guild, then tell ya to Foff when u say the price is 10k.
Sure enough tho it gets them keen, they log over and hehe
Only worked about 3 times over the few days, and think got about 500-1k from each.
It's even funnier when they r too lazy to check the AH designs for sale,
Which sometimes might have an option around the levels needed with using cheap herbs!
Then remembered how much better cutting gems and reposting on Ah is

On low pop realms when patches come out that affect proffessions and makes people switch profs or lvl Alts quickly within a few days, just remember if it might affect u in the long run. If u r a big flask seller, then pump 10k in keeping the lower mats needed off the AH simply so people can't level them. There's no DIRect way of knowing if u get the 10k back but damn it feels good/funny.