An MA will give you access to jobs in places like universities, where it is usually a requirement. These jobs do tend to be better paid and more comfortable than many regular teaching positions. Some places pay more for staff with a Master's, but many will not- the main advantage to me is university and other specialist positions that you can get. There are many schools where you would be paid the same as someone without it- that really depends on the place and the value they give to the degree.
- For Teachers