Myself - I have always wanted to fly a shiny jet (just like most other 20-odd year olds) and also instruct to build hours.....
However with the cost of training the way it is, most people dont have much choice but to go to the airlines and pay of there debts! I for one will definately come back to bash round in a C150 part time if I can (900hr limiting) and instruct, its great fun, easy work and rewarding!