What does Casual Raiding really mean here?

[kotton05]

Rustle = non tracking guild, we dont award dkp for staring at screens unlike a/a but they can still mobilize and kill the same as A/a, thats a casual raiding guild, actually can clear VP and ToV themselves.

in a stark comparision a Casual Scum Guild can pretty much clear HoT/fear/hate themselves but not much else and may occasionally see a rare raid target.