Alright, I know I've posted on this before... In the past I've noted that there are times when Ravech appears to be wearing a toupee, and there are times when his hair looks authentic.
I have recently purchased an HDTV. This has greatly aided me in the study of obviously very important topic. In the past I was wishy-washy on the exact toupee/legit hair status... Using technology, I can now conclude that the preponderence of the evidence suggests that Karl Ravech does indeed wear a hairpiece. It has long been my suspicion, but now, upon further examination and review, I declare it definitive.
As an aside, I am greatly greatly greatly disappointed that the rest of the BBTN cast doesn't chastise him or drop casual inneundo making fun of Ravech.