My own experience would seem to bear this out. A couple of years ago, I had cause to have my own T-levels measured (along with my levels of various other hormones), and I was surprised to discover they were bang in the middle - neither overly high nor overly low. I'd always assumed they'd be more towards the low end of the scale (not just because of my CDing but because of a whole host of other things as well), and, yeah, it was a surprise to discover they weren't (a bit of a disappointment too because medium T-levels seemed so average, and therefore boring!).