nicksr1125 wrote:
If a Sony is proprietary, so are Canon, Nikon, Panasonic, Fuji, etc. bridge cameras. You can't use just any battery in any of them. Only the original battery or a match made by another battery company will fit. Otherwise you can use almost any accessory that will fit. A 55mm filter is a 55mm filter no matter whose brand name is on it.
As for proprietary price, all manufacturers have a minimum advertised price policy.
I don't know about other models, but I have a Fuji bridge camera (HS10) that runs on AA batteries. I keep it (as well some Canon sx-series cameras) for folks who show up at workshops without a DSLR ( as instructed) .