It's not 10x by any means but it doesn't need to be at most dev salaries to pay for itself. 1.5x alone is probably enough of an improvement for most >jr developers for a company to justify $1000/month.
I suppose if your area of responsibility wasn't very broad the value would decrease pretty quickly so maybe less value for people at very large companies?
edit: Fuck I'm getting trolled
I think personal subs are subsidized while corporate ones definitely not. I have CC for my personal projects running 16h a day with multiple instances, but work CC still racks way higher bills with less usage. If I had to guess my work CC is using 4x as little for 5x the cost so at least 20x difference.
I am not going to say it has 10xed or whatever with my productivity, but I would have never ever in that timeframe built all those things that I have now.