Yup, I've seen it on rare occasion (we were the 'pet' so to speak). Once upon a time we NEVER went to another teacher... when finally we did (at the same studio), we felt our original teacher was more interested in our lesson than the one they were teaching. Another Pro has since commented that when students go to two dozen or more different teachers, it makes it difficult to "care". Maybe the other couple (in our example) had been going to every other teacher in the city. (Not that there's any excuse for it, but seems to me it's the chicken or the egg syndrome... you don't care so I don't care, but I didn't care cause you didn't care, on and on and on).