My terms are pretty simple:
My logo must be displayed either on a membership page or the page where graphics from my site are used.
Nothing from the members area may be sold from your site As Is
No sharing your user name and password with others
No refunds are available once you log in.

Tube Usage:
Tubes can be used to make sig tags, websets, stationary, etc for free or profit.
Tubes may not be sold or given away As Is, something must be added to them, such as names, words or other tubes.

Lineart Use:
You may use lineart to make sig tags, websets, stationary etc once they have been colored in.
You may color lines and add them as tubes in your members area or purchasewear area without needing to purchase any extra licenses. However, please do not sell them for AS Is use, end use only.

That's it for now, pretty painless right? These may change from time to time however I will notify you of they do.