I have my wishlist enabled by default but I only see one product showing the ability to "add to wishlist". I'm aware of the Product Settings > Appearance > Hide 'Add to Wishlist' button which I do not have checked. Also, I see the option in the Appearances section for each specific product but there again I do not have it checked to hide.
 
Is there another place that affects this maybe at the category level? Or another setting I'm not considering?

OK, I found the answer to my own question by digging through the code. I found that if you have a value in the "Direct Link to buy product" which seems to be defaulted to "xyz" in the Admin > Products > General area then the "Add to Wishlist" option does not appear.