yes i noticed this too.not all of it is. I bought the costumes from the psn store, but I had to pirate the gamestop exclusive content. I know dlc is normally stored in the addcont folder, but if u use it with mai, it goes in the dlc folder in the app/title id folder. I have it working with the mai dump in this way.
i had phantasy star nova dlc, all of it was the available on the store.
i dumped my game so i could use it on my vita tv too, dumping my dlc (maidump can't/couldn't dump all the dlc at once so you had to do it a bunch at a time)
when i installed my dump to test it, all my license files for the dlc were gone!
but because in the last week or two sony locked down us connecting to psn/activating, i wouldn't be able to get my license files back from psn, which is bad.
this was like a year ago, and i had a backup of the files anyway, so it's ok in my situation.
so yeah, if that is what you did, it makes sense