For me, their allure is:
The timelessness hinted at, by being so remeniscent of their prehistoric roots.
Their eyes look deep and wise, not lifeless like other reptiles.
Their homes, so securely carried along with them...allowing them to be totally independent of the world...or not, as they see fit.
The perseverance implied by their slowness, yet they survive and prosper.
Their acceptance of our manipulating them, yet when you gaze into their eyes, you can sense the endlessness of the universe.
When I hold Grandfather Turtle, I can sense how he might weep for my selfish humanity. I can also sense how he forgives me for it, too.
Yes, I love these little turtles, for all they'd teach me...if I'd only slow down and listen.