Last Winter I went to a VEC art class - a short course of ten, two hour sessions.
I paid a fee of course, but as usual there is always one character who feels we should 'buy teacher a present' at the end of the course.
I and some others felt it did not necessitiate buying a present, particularly as the course was by no means fantastic. However, some still went ahead and passed the envelope around - I think it is a silly practice which needs to be reviewed in the present state of peoples finances.
Seriously! That is just wrong, I don't get the mentality of people who would do that, it's not like the teacher was doing the job for free!
Going slightly OT, it's the same with parents buying school teachers a gift "from the child". Wholly inappropriate and was thankfully banned when my son was at Primary.