Our guild I can’t give you a good number on, since we have soo many bleeding alts just quoting that number will leave a bad number (I think that number is over 80 by now, we have nowhere near that many people). We can have up to a good 15 on at once, hardly a giant guild but not tiny. We do often dip (especially on week days and late nights) to about 3 or so. It heavily depends on the day, prior arrangements etc. Most quests can’t be “actively contributed” to, most quests like that are instances and can only be done by that level. If all else fails we’ll pick up someone from outside the guild, maybe we’ll jokingly berate you the next day but we’re good natured. Any quest involving a lot of money (i.e. a Warlock epic mount) is more of a personal thing and falls under the rules of “donations appreciated” noone’s gonna force you to do anything.
We don’t use the in game voice chat. We have a ventrillo server, but mostly we use the in game text chat.
The next questions rely heavily on person. I tend to make tons of characters and then wind up on one or two regularly. Some people keep all of their characters relatively the same, and some people focus totally on one and either never make an alt or make one when their main is completely decked out.
Powerleveling, as in paying a service or using a bot to level is strictly prohibited under the Terms of Use and EULA and is a bannable offense. Powerleveling as in using a guide, grinding, or playing 24/7 is, no matter how unhealthy for you, completely within reason and many people do it. Any sort of automization script is also prohibited so no buff bots, the best you’re getting are a handful of UI mods that automize tiny aspects of the game, though many of these are broken by patches, Blizz tends to take a no crap approach to removing player interaction (for the most part).
We didn’t tell the guy- he would have been pissed…