There are many different reasons for why we join guilds: to raid; to meet girls (well, not usually to meet girls). We also have numerous reasons why we quit guilds. I was kind of amazed by Oreooze of Dalaran's list of reasons for why he /gquit.
1. He wasn't congratulated on his achievements.
2. He doesn't trust people online.
3. He didn't get invited to raids.
4. He didn't want to get Ventrilo he prefers not to use voice chat.
It sounds to me that the OP was not terribly interested in being a part of a team. I have to admit, I would have a hard time inviting people to raids that absolutely refused to get into Vent. I'm sorry, my friend, but real time communication is very important to success in raids. It is positively infuriating when someone wipes a raid because they missed an important instruction. I'm sure that some guilds can get by raiding without voice chat, but it's very frustrating not to have 24 people who can listen in and work with the team.