Personalization really makes the gift more valuable than its money's worth. Parents love to cherish gifts personalized in their babies' names for years to come. The child too, would want to keep the gift forever, for memories' sake. For just a few dollars extra, the gift becomes a keepsake item that cannot be easily parted with.
It may later help the child as an association to his/her childhood memories.
Sometimes, people don't like to put long messages so you may also cut it short. Also, only the name of the baby and one descriptive word could be used. It is not uncommon to find old blankets labeled 'Adorable Kristy', 'Naughty Jean', or 'Little Amanda'.
The cartoons may be used to cover the entire blanket, or merely in one corner. It all depends on the ingenuity of the designers. Apart from the usual characters, you can add any animated character too.
If you think that these blankets cost too much more than the normal ones, then you are mistaken.