Here's a group shot of all my ballerina dees. I got my first pair (black Ferrari ones on the very left) over 2 years ago and you might be able to tell how much I've abused them. They still look great from the outside but need to fix the interior. I have a shopping tendency that if I like a style of shoe I tend to buy the same one in different colors. You can see that trend in my collection.
The doubles I have are the white & grey pairs on the upper right corner & the center 2 in the lower side (purple & navy).
Tooomz - I really like your patent taupe pair with the lilac button detail! I see nothing wrong with buying multiple colors in the same style. If you like it, why not? Rarely, but once in a while I find a shoe that is incredible and I buy another pair of the very same to put away for the time the first pair wears out.
Here are my Tod's ballerinas - bought between 2005 and 2009. Not all are dees but I thought it would be fun to take a group picture. I love how comfortable and pretty they are. They also hold up really well. It rains a lot here though so suede is not the best for fall/winter.