I do not like the idea of paying 12 months in advance or paying over £ 5.00 for one months WM Pro perhaps a compromise of 3 months for £ 15.00 makes it more affordable to customers.
Onto ideas as an incentive for WM Pro subscribers why not offer free pitch upgrades to the level of your main stadium saying that we the customers have already paid around 15 million credits for top level pitch and perhaps a free 3,000 seat stadium as well or instead of making youth teams only available for WM PRO subscribers.