What is the point to purge and Dispel?

[d0z3rr]

Is it me or does it seem like these don't actually Purge or Dispel anything?

I have Purges and Dispels on spam buttons and when I see stuff on my guys or the mob I spam them and I get the old Nothing to Dispell message.

So what is exactly the point of Purge and Dispell?

Purge only purges beneficial magic spells on enemies, not any harmful magic on you.

Dispel removes both harmful on you, and beneficial on the enemy. Are you trying to Dispel a disease or curse? Won't work.