Here, here - I'm wondering about this as well. I (for the first time) used a couple textures in my challenge entry this month. Now, I'm not selling it or anything but some day soon I wouldn't mind it if I was able to get into doing a few commissions and retire on the beach, ROFL. I did put the little tag line they want on anything that uses one of their textures so I hope that I did that much right.
This whole question of whether I am safe using them or not makes me really lean toward not using them ever again. I prefer to do all my own artwork anyway but it's nice now and then to be able to use textures you don't have to go find and create.
If I understood what I read on the CGTextures site: it's ok to use their stuff and sell it. So long as you are not actually selling the texture as a texture. In a piece of your artwork it's no problem. The issue seems to be if we can use them and have the CC on what we post and share. It sounds like they are saying no.
Thanks for starting the thread Mid. I for one want clarification.