Ok, if you are a professional and/or use your camera constantly for xx hours at a time, i can see why you would want a battery grip. But why do amatuers / weekend hobbiests bother with it? My battery on the 30D lasts weeks at a time (yet I have 2). I had a 350D and the battery was not as strong but still good for a weekend for this hobbiest.
Thoughts?
Thoughts?