It can be annoying but I think the loot systems themselves are a bigger problem than people not rolling.

In 8 man raids for example the big reason many don't roll is because of the loot system itself. In o12 for example players wont roll on the shaft they want until the other items have gone from the loot pool. Increases there chancez of winning.

Roll against 7 people. 12.5% chance to win.
Vs wait till people have won the rest of the items and roll against the remaining 4 people. 20% chance to win...

Problem is if someone else wants the crank they night not roll till the shafts and springs have gone from the pool. And thus everyone is waiting for everyone else .