It might not be due to low sales. I've heard they are having trouble keeping a beer (can't remember which one) stocked local to them due to high demand.
I wish a few mid-tier craft breweries would pull out of Iowa to free up some shelf space for the influx of top-tier breweries that are soon coming.
Flying Dog basically pulled out of all States to put all it's production into Dead Rise Old Bay Spice Beer.
Ya I noticed them slowly disappearing from the shelves here in Wisconsin also. I love Raging Bitch but now that Bedlam is year round I have not purchased it in a while. Hope they are not gone forever as I really do enjoy a few of there offerings.
They pulled out of Wisconsin last month, seems to be a scenario similar to the DogFish one a few years ago where they had to pull out of the state and get reorganized to meet demand.