I've hardly ever worked on anything that ISN'T all rusted and frozen. I live in the northeast with lots of road salt and mixed weather.
And I always tend to buy older vehicles - current truck is an 88, jeeps a 96. Any tractor/equipment I work on is pre 1960.
In fact, maybe that's exactly why I don't have the trouble.
I learned long ago not to be shy about using heat - if it even looks like it's going to be trouble, I might try an impact, but more often I just heat it, remove it, and move on, don't waste time fighting with it. I actually use the torch more often than an impact gun.
Even so, my breaker bar still gets plenty of use on blind bolts, etc. - but I guess just not enough to break anything.
I do find it surprising so many of you say this is a common occurrence (with the cheap stuff anyway).
I will look at it a little differently now - but still - if I had to pull my checkbook right out... I'm not convinced enough to say I wouldn't go cheap on sockets.
Apologies again to the guy that started this thread - kinda branching off here, not answering your question.