True, the Baby Pokémon are not very exciting, but they give out lots of rewards (breeding-useful items) and are easy to beat on your own, which I think is the point of that part of the event.
The high-IV Ditto on the other hand are extremely useful (for those that don't already have them, such as me) and any extras that you accumulate will be valuable later on when the event passes, so you might trade them for something nice.