Proto=Williams and you could probably exclude Wright in there. I’m sure if you compare apples to apples they will be a lot closer. Who buys there sockets in individuals most people buy sets then fill in a few here or there in individual so your $100,000 example doesn’t hold water. Snap-on runs BogoS from time to time on the truck for impacts. Like buy metric get sae free. If you like proto buy proto I didn’t tell anyone they have to buy snap-on. But you get more than just truck service but if you used snap-on tools you would know this.
Proto absolutely does NOT = Williams. Well over half of Williams is Taiwanese. Well over 90% of Proto is US, about the same as Snap-On. I will put any of my Proto tools up against Snap-On any day of the week and twice on Sunday. I have several Snap-On tools, and while nice, they aren't anything special beyond the other US makes (I have a lot of different US makes).
What appears to be Snap-On's largest set is approximately 867 pieces for roughly $49k, which is far from a COMPLETE set that senior level professional mechanics would have - hence why they are always buying more tools.
Add-on sets in the $4k-$20k range
$100k for a complete professional mechanics set is VERY plausible, if maybe slightly high.
Meanwhile, the largest kit Proto sells is the 1258 piece Master Technician set at roughly $16k
Add-on sets in the $1k-$9k range
$30k for a complete professional mechanics set is VERY plausible
Granted, the Snappy set comes with a 54" top and bottom tool chests and the Proto doesn't, so add another $3k for a 55" top and bottom Proto chest set.
And with the Proto set, you're already starting out with enough extra tools to cover another $7-$10k Snappy add-on set.
Now, don't misunderstand. I don't hate Snap-On. I literally just ordered a couple Snap-On ratchets last week (should arrive today) and have several other Snap-On tools. But the fact they are very over-priced cannot be disputed. And SOME of Snap-On tools I do prefer, like ratchets (I do like the design of their chrome handle ratchets over the Proto design), but other tools, I'd rather something else, also Made in US.