Medium sized guild on G. We schedule raids and events internally and have 6-12 show up, but we have 50-75% waiting on the mod. We filled a guild only Hound raid just last week. I haven't heard of any guildies quitting DDO for something else however, just playing other games until it launches.
Valiant Accord has about 25-35 players normally.
I'm logging in about once every other week to run a raid, or do something with the guild, but not much else.
Tomo