Digital camera stores gave a good hype in selling their cameras by promoting the size of pictures it can create once you use it. And people thought that the higher, the better. Well actually, it depends. Because if you are not a photographer, you will not need pictures more than 2mb.
Websites only uses pictures between 10kb-700kb. The larger your picture is, the more your website suffers from loading time, as well as with the bandwidth consumption.