Breakfast Topic: Spec for yourself, or for the guild?

This question actually came from Guild Chat in <It came from the Blog>. A few evenings ago, there was some question about the best spec to level a Druid with, and while many people returned Feral, just for ease of soloing, it actually brought up another point. You see, our little Insider guild on Zangarmarsh is very much focused on being completely laid back. This means we have no intent of running endgame raids, or anything of that nature. Obviously, this means you can level as hybrid or off-spec as you like -- points in all three, or points in none if you're out to try something completely off the wall!

But this got me to thinking about a guild I had been in. Once upon a time my main was a Mage, who I took to endgame on a combination Arcane/Fire spec that I had an absolute blast playing. Once I got to endgame, I specced her Frost as all Mages at endgame were then expected to spec for raiding. After raiding for a while, I got incredibly bored with her. I wound up switching full-time to my Rogue when the chance came. Now that Burning Crusade is out (and my Rogue is comfortably at 70 with my Druid catching up) I've finally taken my Mage off the mothballs. After speccing her back to Arcane/Fire, I'm having a lot of fun tearing around and burninating the countryside with her again.

For those of you who have ever switched a spec for a guild/group/battleground, how did you feel about it later on down the road? Did you miss being able to tinker with your build? Did you resent having to do it? Did you get bored with it? And for those of you who say that you would never spec for a guild's progression, would anything ever induce you to reconsider? Have you ever switched back, progression be damned -- or even left a guild over being required to keep a certain spec?