So somebody being unfamiliar with his music isn't a surprise.Herb’s impact can’t really be gauged by sales because he’s not a commercial rapper
It would be like saying “but Jim Jones never went platinum how’s he influential”
Herb was like a drill Lil Bow Wow and was the chosen one from Chicago after Keef
He has classic street songs and probably did net millions off touring hood clubs and arenas
If you weren’t outside 2014-2016 and you judge rap by sales then you’ll miss the real influence