Is it a scam so they call sell them for more money?
Specifically batteries like this:
I went to buy a new battery for my oldish camera today. The last time I bought a battery for it I went to the big box electronics store and picked it off the shelf. I think I paid about $9 for it.
Today I was faced with dozens and dozens of batteries that were so similar to one another as to be exasperating, not to mention expensive -- $30 and up. The only difference seemed to be the spacing of the contact points.
I'm guessing that there really aren't that many manufacturers of batteries. Wouldn't it make sense for a camera manufacturers, when they design a new camera, to space their contact points millimeters differently so they could use a common battery? The batteries are all exactly the same size, with the same voltage.
What the hell is up with this? Can anyone explain this to me?