Let's say that I'd like to work for the language school that offers the best pay per hour. I have no problems teaching in companies, universities or language academies.
Try ACT (Advanced Corporate Training), Lang LTC and Mike Mills. You could also try the British Council, they tend to pay the best but the environment there is certainly not for everybody. You could also try Cambridge school, they pay a little less than the other schools I mentioned but I can personally vouch for the management there.
I just don't want to teach in primary or secondary schools as most kids that age are not serious about learning languages.
If you don't want to teach secondary school aged kids, you're much less useful to schools.
Well, I know I'm not going to get the same money as in England
Actually you can: I had no problem charging 150zl (£30) for 90 minute lessons arranged privately or direct with a company. Cut out the middle man and your rates almost double.