A single digit error, then yes that could be a typo. But two digits....not buying that.And his prices are really not in the ballpark ever. They're somewhere in the bleachers.
He lists a LOT of cymbals. It isn't unreasonable to think that he got two of his cymbals confused when he was listing a batch.
The one cymbal I bought from him was priced fairly. It was a very specific model/year, and at $400 it was maybe $50 higher than the 2 or 3 others I've seen on eBay over the past couple of years. And his was in much nicer condition. So yes his prices are a bit high, but "not in the ballpark ever"? That hasn't been my experience. There are certain other vendors whose prices are consistently way higher. YMMV.