My company wants me to stay, and gives us enough paid preparation time. This is an excellent situation and the General Union encourages all companies to follow this example, but the situation at your company could easily change. If you have a one year contract, your company could terminate your employment by not renewing your contract. If your company wants teachers to stay, they should offer indefinite term contracts. Conditions have been gradually falling in the industry, wages have generally gone down while hours have increased.
Companies are more profitable if teachers teach more hours for the same monthly salary.
If this trend is not stopped the few remaining companies with good working conditions will either follow the big companies or will be pushed out of the market. Therefore, if you have decent conditions now, it is in your interest to join the union and help us all achieve good working conditions. We should be striving for a language industry that competes on the basis of quality rather than low labor costs and expensive advertising. I don't work in a conversation school. These issues certainly do affect you.