Back in the day I've run over 150 times a specific dungeon to get 1 bolt. Everybody and their mother were rolling on these items, and every time RNGesus didn't like me. A week later these items were removed from the weekly lockout and every time you would run that dungeon, people would just leave, dropping 2+ items into your inventory if you weren't fast enough to remove yourself from that said instance.

Did it bother me? Nope because that's the way games work. Sometimes you have to "grind" to get some items, on other days/weeks you only need to run it once. You have months sometimes even years, before a new expansion/patch/removal of lockouts hits, what else would you do in the game? Right nothing, so put some effort in it and get the item you want, even if it takes more than one run. There's no reason to modify the need/greed/pass options on duties, just because it isn't 100% drop rate or obtainable every time.