Bear in mind that this guide was made back in 2008 when this game first came out and people were prejudice to winds and earths.

Back then everyone thought only fire and water mages was the most useful and needed element and that earth and wind was a "hobby" element. You were ridiculed and bullied for having a earth or wind or even a water killer. So it was hard for a wind or earth to burst unless people made their own teams. Even today you don't see earths and winds asking for burst, that's because people have learned to just make their own teams.

Also with that in mind remember that was also back when people thought you needed 200 wis... lol people were still learning.