Because the battery grip adds a fair amount of bulk and weight to a camera that not everyone (in fact, very FEW users) will want. Whenever Olympus or any other maker releases a camera larger than an iPhone withOUT a grip, they tend to get tons of complaints and they keep Richard Franiac's business humming along, so I think the "gripability" function is actually quite important and a fairly big deal. A VERY big deal if they'd left if off. Gripability makes a big difference. I had an EP3 for a month or so last summer - it came with a grip in the box but not attached. WIthout any grip, I thought the handling of that camera was quite poor. WIth the grip in the box, it was improved but only very slightly. And Olympus had another larger grip that they sell for the EP3 and I got one of those and the camera's handling was more or less transformed from good to wonderful. Grips matter and it looks like they're starting with a fairly substantial one on this camera, which I'm all in favor of.Just out of curiosity: What's the point of the grip? I mean is it really just a grip or does it add some functionality to the cam (except 'gripability' of course ).
I mean why have both a grip and a battery grip when the whole functionality could have been archived with just the latter?