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From the looks of it in you catching a likeability potion you're using leftover bait from one of the fishing events. Namely.. from the event you would catch a special coupon for one of the helper puppets. This is a well known issue from that event bait. Use normal bait and you will not have such issues.
Another reason people find them useful is for training specific skill sets. As stated before by Hardmuscle, one could derank whole skillsets they no longer use and reallocate the AP. However, another use for it is for training skills others cannot easily do so anymore due to Skill CP. Resetting all skills resets ones CP so they can micromanage the skills they are training to get the CP requirements done easier.