Thanks for the PM, (apologising for having mis-read my post) Doc.
In fact, I taught in a Language school for just over a year, but in a college of further education for 4 years. The latter included some High School students, but mostly Higher Educational ("Provoshaw?) College students. [I also did some extra-curricula teaching of Hotel staff.]
And yes, I was comparing the two.
I think what I was trying to say, was that often the BG's had greater motivation (i.e. a greater desire to learn) than the College students, who (as per the original post) often played around, took nothing seriously, yet the school ultimately felt obliged to pass them, simply because their wealthier parents were paying the school fees.
Their objective seemed to be that everything had to be "sanook".
If there was a school Karaoke competition, or cheer leader training, on at the same time as their English lesson, they would always skive off the English lesson, (regardless of who the teacher was!!).
As I said, the BG's were, I felt, often more motivated (than the College students) - wanted to learn English that much more, but at times struggled and became frustrated if (like me) they were unable to remember things easily.
My original post was intended to be both a comparison and an endorsement of the original poster's comments.
There are always exceptions, in both camps!! Let's say a number of the students I taught tended to have limitations. 
I read that he was comparing his bar girl students in language school to students in his college classes 
