Because not everyone has a full coil set yet? Because not everyone's even -at- Coil yet? Because some of us have a life outside game that invovles work, school, kids, significant others, ect that disallows us the ability to run WP/AK 50 times in a week, and we're lucky if we get 1-2 runs a day in? Because some folks decided they were going to pursue crafting/gathering for awhile instead of tome grind? Because some of us would like the extra practice (not to mention better gear) before trying to to take on coil? Because the game's development doesn't revolve around hardcore raiders alone?

I'm sure folks can think of more.