It seems VR and IS in reality, occupy a fairly narrow band of usefulness.
Anybody can dream up circumstances where VR could make a difference.
I mean, it has to be for a specific use, nobody leaves the house intending to shoot landscape for instance in dim conditions without a tripod, that would be either daft or not really a serious attempt, after all we don't know what the conditions are till we get there.
It can't stop sports, or any kind of movement, so that's out, so we're left with static poses and "just in case".....just in case what ?
Static poses are doable with flash, but not always, so where's the value in VR IS....music gigs, weddings :shrug:
Nice to have but ultimately, not that useful.
Yes, when you put it like that (which I wouldn't) but here's another thought. Camera shake is ever-present. There is no such things as a shake-free image, it is just reduced to acceptable levels by faster shutter speeds. When you're looking to get the last drop of sharpness out of a sensor like the 15mp fitted to the Canon 50D, then even at relatively high shutter speeds you're going to need all the help you can get.
It would be interesting to put that to the test. I suspect that if you did, you would find that the old focal length = shutter speed rule would prove highly optimistic. And in terms of ultimate sharpness, an IS/VR lens would show benefits even at medium shutter speeds where absolute sharpness is normally taken for granted.
As for the cost of IS, here are a few comparison figures (WEX prices):
Canon L 70-200 2.8 Non-IS
1310g, 18 elements, £1050.
Canon L 70-200 2.8 IS
1470g 23 elements, £1550.
Canon L 70-200 4 Non-IS
705g, 16 elements, £550.
Canon L 70-200 4 IS
760g, 20 elements, £970.
Canon 70-300 4-5.6 IS
630g, 15 elements, £426.
Canon EF-S 55-250 4-5.6 IS
390g, 12 elements, £222.
The incorporation of IS into both L lenses costs a lot of extra glass, and money, but there's not much difference between the f/2.8 and f/4 versions in terms of extra elements and price.
The 70-300 IS is very well regarded, and doesn't appear to carry a significant penalty for having IS.
The EF-S 55-250 IS is a lovely little thing. Sharper than it has any right to be, light as a feather, and very cheap. It's not full frame though.
On the basis of this very simple comparison, there doesn't appear to be a huge penalty with wide aperture lenses with big elements (other than the obvious weight of the glass). And it seems that if a lens is designed with IS from the start, it doesn't cost much at all - no more glass, no more weight, no noticeable price hike.