Different meanings of FPS. Yes, FPS is a measure of frame speed for video, but it is also a measure of the burst speed of a camera. Video frame rates are typically 24, 25, 29.97, 30, 60, 120, 240 or 480.

The FPS that is generally referenced when talking about still cameras is not the same. It is the number of full pictures that the camera can take per second. While a DSLR may be able to shoot 60fps video, it is only capturing around a 1 to 2 megapixel image when doing that, which is far less than the resolution of image the sensor can produce. The problem is that it takes time to move data from the sensor to the processor in the camera. So a camera that can shoot 24 fps video may only be able to shoot 8 fps of full 18MP images. Additionally, it can generally only shoot a certain number at a time (often somewhere between 7 and 50 total images depending on resolution and quality that is used. Do note that this can only be sustained for a short time though since once the fast cache in the camera fills, it takes more time to move the images to the memory card after processing. This is why burst can only be used for a short time before you have to wait for it to empty.

It doesn't have any direct relationship to the price of the camera as it is also dependent on the sensor resolution and different models may give it different priority. It might, for example, be possible to find a 12MP camera with 10 fps and the ability to shoot 19 full quality images at a time for less than the cost of a 22MP camera with the ability to shoot 8 fps and only store 17 full quality images at a time, but if you think about it, that actually makes sense since the 22MP images are much bigger than the 12MP images, so while the FPS may be lower, the 8FPS camera is actually moving more data.