No real reason to get it unless you have a need, I am "the shop" so I got it and we work on huge variety but its really rare to need it, to the point I dont keep it on my service cart and don't even keep it all highly organized.
Most auto parts stores have a single selection. I got jammed up out of town a while back and when I scored a new part bought a socket for 4$ to go with the job.
Back in the day a mechanic needed to be better prepared, now you can buy most stuff needed on demand. Shopping is so much better than it used to be, so much more competitive and can have an auto parts store drop deliver something in an hour.
I had a job in the other day that needed extra parts, instead of making the drive sat around drinking coffee and doing the general service while we waited for next parts run.
Had a Kal-Van Northstar water pump too sent with the job, no point in spending more and waiting, used it once, none of my Buds even had one and a 300$ version wont help a bit.