hey Ronen
since your re-selling items, and you have your own tanks it gets confusing.
make it simple, anything you order specifically to sell to others place that in the vendor section.
if something is coming out of your personal tank put it in the for sale section.
the group buys are when people are offering to do a group order to save on shipping or get discounts, no one is making a profit. so if you want to do a group buy that's not for profit then post in group buy, if it's for profit keep it in the vendor section.
I believe this is right. I'll check with the other mods and see what they say.
don't stress over it though, if something's posted in the wrong place we can always move it, no biggie. we just don't want to do that all the time