I also take a middle ground on rolls. Usually I will leave the rolls at FFA because I don't feel like going through all the screens and clicking corpses. I will usually pick up all the DE purples and split the void crystals between enchanters in kara, which is usually 90% of the loot from there, and ignore all the other green, grey, cloth and such.

Out of courtesy, since I am only 1 person, I usually only roll once for items if its BOE epic. The blues are usually ignored.