maybe it uses less fat if you have a higher magic app?
ok, here's the stats for "magik sword":
Magick Sword
0 N/A Value : 0 Weight : 80
D: 1-8 (+8) FT:1-4 (+2) Wgt:80 Spd:10 Hps:80
also for "magik staff":
Magick Staff
0 N/A Value : 0 Weight : 60
D:1-8 FT:3-12 (+12) Wgt:60 Spd:8 Hps:60
looks like you can get more damage out of it with a higher m/a, as well as use less fat.