True, but once more comments are added, the link will disappear off the page.
If your group is Super, you can use the thumb code for any deviation to display a thumbnail link. The thumb code is on the right-hand side of the deviation's page for each deviation. But unfortunately that only works if your group is Super.
If your group isn't Super, you can put a text or icon link wherever you like. We've seen them in a variety of places, including the affiliates description, blogs, signatures, group descriptions, etc.
The choice is yours and we certainly appreciate ANY link back to Grouple because it helps us spread the word.