I think Brad hit the nail(s) on the head. I have a B&J Grover 5x7 in excellent condition. I bought it a year ago with an 8½" Commercial Ektar lens, 2 tripods, a bunch of holders, etc, in the original case for $25.00. I never used it and just sold the lens and holders at a show for a few hundred dollars. None of the dealers was particularly interested in the camera.
The kicker for me was the focusing hood. I couldn't get my mug close enough to the glass to use a loupe. The other thing that was a potential problem was enlarging. My Super Chromega D maxes out at 4x5, and the thought of bringing in a big enlarger to handle the 5x7 negatives made me cringe.
As for glass, watch the coverage. Lenses that cover 4x5 with room for movements are a dime a dozen. Getting good glass on the cheap, with ample coverage for 5x7, is a different story.
I think that had I used the B&J as I had planned, shooting black & white, canoe-camping the Potomac, it would have ended up going for a swim (on purpose).