According to John Fawcett of startup Quantopian, there are roughly 10,000 quants worldwide. (See the Forbes article covering his company, which looks a little like QuantDom meets Kaggle.Com). The good news is that Nassim Taleb has educated almost all of them:
Clifford S. Asness, Financial Analysts Journal, My Top 10 Peeves, here. Very entertaining. The HFT number 8 Peeve is pretty good.
The author discusses a list of peeves that share three characteristics: (1) They are about investing or finance in general, (2) they are about beliefs that are very commonly held and often repeated, and (3) they are wrong or misleading and they hurt investors.