Extractors do break from time to time. Not as often with USGI extractors, but it does happen.
I shot a loaded-standard model M1A when I first started shooting NRA Highpower back in 2005. Personally, I've never broken an extractor: commerial or USGI. However, I have schucked them from the bolt from time to time!
Unless you're having extraction issues, I'd just shoot the rifle and replace the extractor if/when it's needed. If having a USGI version gives you peace-of-mind, it will cost you around $30-$40.
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