Hi Joe,
thats a good question you brought up. I for one was educated prior to being a witness (BA Business Management) and I did see problems in the literature right from the beginning. The elder I studied with down played those issues and told me it was not necessary to believe everything in the magazines. This changed drastically once I got baptized though and it became even more difficult to stay or to even hand out this nonsense at the doors.
It is my personal experience that some do come in educated, but do not stay long term. Those who become "lifers" are usually from less educated backgrounds.
Most of the people that accepted studies from me, were of the high school education level, but some below that.
I hope this helps, this is my experince. I know the WT likes to keep you uneducated so there is something to your observations.
Have a good day Joe, by the way that is my son's name too (and was my dads) . And I never met a Joe I did not like.