In your defence Turbo, there has been and still is a lot of young pilots who use this route for hour building. In the early days you need to gain 700 hrs to use your CPL, but this changed sometime ago with people going direct to the RH seat of 737/320 with less than 300 hrs. In the USA the limit I believe is 1500 hrs, which is now causing a lot of pain for the small airline operators.
Fixed wing flight instructors are in general very poorly paid and as mentioned the role tends to be part time or sessional.
Add the cost of an FI(R), which is in the order of £8000+, completion of the ATPL exams £4000+ and you have the result of putting most pilots off going into professional flight training.
In the UK the term CFI is a nominated post within a flight training organisation, we have FI(R) and FI, which you can add various ratings to for IF, Night and Twin ratings etc.