What will keep people from stealing these?
Lack of knowing what it is, I assume, is what will keep them from being stolen.
I feel like the market for this product is ridiculously small.
Backup cameras first started being put onto production cars in Japan in 1991. By 2000, some US cars had them. By 2012, over half of all new cars had them.
So the first assumption for the market for this car is that their car is either pretty old, or has less than average technology for its model year.
The second assumption is that they want this technology and have $500 and a smartphone.
I feel like the first and second assumptions cancel each other out though - if you wanted it, you had the spare money, and you buy tech savvy products, why didn't you get a car with a backing camera?
I kind of meet both assumptions, but my 2004 car would have been replaced a few months ago if it weren't for the fact that I'm waiting for the Model 3. I'm not going to buy something like this that's only useful for the next year or so though - that's silly. My car is going to the junkyard when I'm through with it - this camera will be worth more than it is.