Dare is right. I concentrate purely on my Champ and you pretty much are forced to get attribute equips. I went the bossing route so naturally I would get attribute weapons along the way. I hunted for my GLS (140% Dark Attribute comped) and I would probably never sell it as I see myself always using it. Killing monsters in 1 hit instead of 4 decreases grinding time and gets you less killed. Sometimes you don't even have to use buffs which is the beauty of attribute equips. In addition to what Dare said, your skills being really high up there in the mp cost makes it a detriment to grind with your skills anyway.
Tut Seals 777
Tombeth Seals 398/777
Aki is my Lucky Seal Bunny.
Special Thanks to DeliTO for my 5th Anni Skill ^^