User blog comment:IamJakuhoRaikoben/Chapter 487: The Third Seal, Review./@comment-2214433-20160530223310/@comment-7418318-20160531094558

We've seen mages with way more than 3 kinds of magic, so why should Demons be limited to just three curses?

Besides, Bradman sucks in the use of those curses compared to those who specialized in just a few, so it did him little good to have so many. If he was good at using just a few of those curses, he could easily taken Gajeel out with just Macro or Kyouka's sense manipulation. Neither did he use Jackal's ability to put curse-marks on someone who hit him to later blow them up or Tempester's lightning attacks, which would have worked very well against someone turned into iron.

Granted showing off so many abilities might have an intimidating effect, but if you have abilities that can instantly take out your enemy, why go for psychological warfare?