This is true in a lot of "drills". This drill I found from google images, is what I would call a true drill with the "ears" at base. When you see bases such as nomads its pretty obvious that they were from a worn out projectile. It's common knowledge that prehistorics were "frugal" and practical. Drills are pretty interesting lithic tools to study. Though the fact that they had a broad range of uses makes for interesting debates and ideas, but the basic fact about drills is they were used to drill holes or even as punches and in many many various other applications. Also I'm sure there was a lot of firestarting with the bow drill as HotZone said. I've never thought about how widespread the bow drill was in ancient cultures, if some groups used it and some didn't or was it that pretty much all cultures started fire that way.
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