As I noted, even the best batteries fail, but why increase the odds of failure to save a few dollars?
Because the odds of that, as you mentioned, are small, and because the OEM's fail too. And because I can have 3 or 4 aftermarket batteries for the price of one hilariously overpriced OEM battery. Moreover, maybe Canon will feel the pressure to lower their margins and sell batteries at a reasonable price.
I have one Canon LP-E6 and about 4 Maximal Power ones. If I only bought OEM, I'd have maybe 2 batteries and I'd have been screwed on longer trips without charging. Its the same reason I don't buy Canon lens hoods or other accessories; I can outfit myself with all the gear I need for 25% of the price and use the extra hundreds of dollars on lenses. Just because they can jack up the prices for stuff that costs practically nothing to produce doesn't mean they should, or that I should support them
Lets do a worst case scenario. The Canon LP-E6 is $60 on Amazon, the Wasabi batteries are $15. So, let's say I buy one OEM battery, and 4 Wasabi's. The Wasabi batteries have to have a 50% failure rate and only charge to 50% for me to break even. They arent that bad (in fact, my Maximals are still easily 95% the OEM after about a year), so I end up with thousands of more shots before needing to charge a battery.
Just because 99.9. percent do not overheat and ruin a camera or burn down your house, does not make them a good deal.
Yes, yes it does. Just because something fails .01% of the time doesnt make it wildly dangerous...Id venture my odds of a battery fire are about as good as me getting hit by lightning. Especially since an OEM battery can fail as well, so might as well save money to put towards the insurance I'll need for my burning house...
The reality is that I can read the reviews and make an informed decision. I know I am taking a slight risk that I'll get a dud battery, but, I can also return it pretty easily