But an average table saw used professionally probably cuts more than 700 USD of limbs during its lifetime. So that seems very warranted and no, we will just take care very well is not a real substitute. That is what at least 10% of our parents also thought while we were fathered.
Professionally, sure: It's easy (and correct, I think) to assume that a saw that gets used every day, piling on hours, will do more than $700 worth of damage to its operators over its lifespan -- on average. Even with misfires being expensive (~$400, IIRC), it's still completely sensible to spend the extra money for professional use.
I'm not a professional, though. I may need a table saw for some projects, but the projects I undertake that require a table saw are few and are far between. My use won't wear out the saw in my lifetime.
Usage of a table saw in my own shop will be at least a couple of orders of magnitude less -- averaging perhaps a few hours per year. Furthermore, without an angry boss-man looming over me to maximize production, I can spend as much time as is necessary to optimize every operation in a safety-first fashion.
If we assume that it is just two orders of magnitude of difference, then: Spending an extra $700 for a sawstop-equipped saw is rather unlikely to ever pay for itself in my shop at home.
(Now, that's not to say that I wouldn't want this kind of safety feature in my own shop. The idea of losing even part of a finger forever is much scarier to me than spending an extra $700 one time: After all, I can make more money but I can't grow new fingers. It's just not such a financially-obvious choice as it is for professionally-used saws.)
