I think it may be how we use our equipment, I will probably shoot 1000 clicks on heavy days, using plugged in wireless shutter controls and wireless flash triggers plus always using live view and I assume they all take some power. I carry two extra batteries in my pocket to get through a morning. Major difference than when on vacation and shooting several hundred in a day. Try clicking off 1-2 K in a day and tell me how well the 3rd party do, shoot several hours of video (continuous) and compare for yourself, 3rd party are cheaper for a very good reason. If they serve your needs then by all means do what's best for you, I have learned what works best for me.
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