I would have to agree if your guild made you quit due to numbers you are pushing or not making then you are better off with out that guild. I have seen many elitist guilds out there and most of them do great for a long time but eventually they all have the same thing happen. They fall apart cause people are tired of hearing numbers and other things being shouted at them. Personally the numbers are a great bench mark to use here just to help give people something to strive for however in most cases Guilds are using DPS charters from addons like Recount but don't know how to properly use that tool to its fullest. You can be lowest on the dps charter but higher on the damage done and lower on the Damage taken.