Jim, while I can't speak for iFly, perhaps I can help alleviate some of that frustration. I too bought one of the cameras, and I can assure you that the cameras do work, at least on the 700 - take a look at the attached picture.
I suspect that they decided against carrying the cameras because of little sales potential. After all, most of us can see in front by looking out the windshield. People like you and me are the exception rather than the rule. I fly an Acro Sport 2, and from the pilot's pit in back, there is no forward visibility, nothing, none, nada, zip. Take a look at this pic.
So you see, I too would very much like to use the camera to see in front of my AS2 during taxi to eliminate those s-turns.
However, take a close look at the pic showing the camera view. Notice that the car is shown on the left-hand side of the screen, but if you'll look out in front of the plane you'll see that the car is actually parked on the right-hand side. Why is that? Well, I think the R-CAM as we have here is a Rear View camera, and pointing forward, the hand is reversed. Unless we have a way to overcome that, I think our previous s-turns would be pretty mild compared to trying to steer by the screen view from R-CAM. That's why I advised caution if you use it as your main view to taxi. Make sense? Used for gear-up confirmation, etc, this camera would excel, especially at the trivial cost.
Jim, there are a couple of other things to think about. There are two distinct camera inputs, the R-CAM port for the cameras we have, and the AV (for an external AudioVideo device, which our cameras are not). To get mine working, I did not use the AV port. I used the R-CAM port. Keep these separate in your mind, leave AV out of it. If you plug it in the R-CAM port, then try to use AV to see it, it's not likely to go.
If we could use the AV port, perhaps that might be key to correcting the hand view? But it's my opinion that we shouldn't expect support from iFly to figure that out.
I know this was long-winded, but I hope it helps.
Wit