One of the biggest reasons are the resources (human and computer) for running the server. I know some folks offered to help admin, but this server was never meant to have (or need) any admins for anything. Vanilla is a lot more stable and requires less interaction on our part for the server to run. Also, our streams are probably going to start showcasing less survival and more creative. We've had a custom vanilla map in planning for awhile now and are ready to start moving forward, so we'll probably be streaming and highlighting our building of the map for the most part. When vanilla survival is up and running, everyone is welcome to join and play on it, but it won't be up 24/7. Feed The Beast was more of an experiment on our part to see if we enjoyed it or not; and while it was fun, it wasn't exactly what we were looking for. It was fun at first, but lost its novelty.
I just checked on the server and it's down when it's not supposed to be. I shut it down and started it up again twice yesterday. This is what I was talking about ith stability; we can't afford to get a bigger server right now and vanilla will run best on it.
Once again, sorry folks but thanks for playing. I'll be installing vanilla 1.4.7 now. If you want to hop on, feel free! If not, enjoy FTB and if we start FTB again we'll post it here!
Meanwhile, I'll start a forum post on the vanilla minecraftforum.net site for us. I'll leave the link here for those who wish to join in some vanilla adventures.
It's been fun! Good luck to you all!