More INFO: There are many people who can use a cameraphone, but have huge difficulty (e.g. dyslexia, disability) spending 20 minutes with a simple website registration form that takes me only 3 minutes. Even my dad, who is 84 years old, even knows how to take a photo with his phone. Or writing presto number down on paper and storing it in a bedroom drawer.
The fact is it is often faster to just snap a cameraphone photo or write down the Presto number, than to go through the registration wizard at the Presto website.
So instead of losing $146 dollars (TTC metropass) then your life is saved because you remembered to take a your own private photograph (or written-down numbers) of the back of your own Presto card -- which makes it possible to register your own Presto card retroactively after you already lost your own Presto card.
(and you can always ask your spouse/kid/assistant/etc to register for you, if you have difficulty using the website to register a card. Yes, there's the 24 hour delay to register the card -- and then immediately claim card as lost and then transfer balance of your already-lost card -- to a blank card you now have in your hands -- but hey, you don't have to buy a new Metropass at least!).
Sure, sure, (off my point) yes, theoretically, anyone can "steal" any unregistered Presto card by looking at your card without a photo. They can simply by reading the numbers off your back, then registering it, then claiming the original card as lost (and transferring the value away from the original now-voided Presto card). But, your unregistered Presto card is at risk regardless of using a photo or not. And a cameraroll/note is harder to steal than a physical card. Plus, nobody else can re-register a Presto card that has already been registered. And besides, this wasn't what my post was talking about. That is a separate point from my topic.
Mine was simply alternative time-saving insurance completely unrelated to theft. The risk of your privately photographing or privately writing down your Presto card does not increase average risk, and rather actually decrease your average financial risk if you feel unable or too lazy to register your card.
This works offline without reception, data plan, and you can even choose paper instead of camera too. You're worried about losing a valuable Presto card, but for some reason not registered right away? (abilities, or time, or no Internet during that day, or disability, or no data plan / offline iPod, or in a hurry, or lazy, etc). Then just snap a pic of your Presto card's back. Done! Now you instantly have insurance! Who can argue with that??
This way, you've delayed the dreaded Presto-card-registration work "until only when needed or able to" -- even long after you lose the card. Or at least until you're more able to register (always recommended ASAP, but still!) The odds of lost Presto funds are much higher with physically stolen cards, than physically stolen Presto numbers. There are not as many smartphone-hackers (stealing your private photos) and note-stealing (stealing your privately written-down Presto card number) as Presto-card-stealing going on. Either way, academic, even this is a totally separate debate unrelated.