I think that it is generally agreed that CIPA would only represent a photographer's usage if they use it like CIPACIPA is - at least for my uses - pretty useless. The R3 is rated at 860 shots/battery charge (in "power saving" mode), but I've gotten 4000 shots on an LP-E19 battery as I tend to chimp very little and shoot bursts (action).
The problem with CIPA is that it defines a single and very specific order of events: take picture (w/wo flash), chimp, turn on/off, etc. It's like measuring the the mileage of a car on a very specific road, but you don't drive that road at all.
There is no alternative though so at least it is a common measure as there isn't anything else. OEMs may be able to optimise for CIPA results but Canon hasn't (or doesn't want to) do this. Fudging the figures - a la VW/fuel efficiency - would hurt the brand far more than low CIPA results generally