The infrastructure of most of these schools are incredibly impressive, and I believe that is what they use as a selling point. About 3 years ago i tried to make an inquiry into enrolling my 4 year old daughter at the time. During my orientation, there was a nice young lady who assisted me, but before I left other staff members came around and then the goofing in Twi started. Thought twice about what my daughter could be exposed to.
I went through the same exercise at American International, and I just wasn't comfortable with the reception and what I expect in teaching my daughter according to the standards published on these websites.
Point - too much local language and social influence than on basic education. My opinion. I will yield eventually to something soon. They are all incredibly exorbitant, perhaps only to weed out not-too-serious applicants...