Taximan : If you plan to export mobile. Then there will be a time you will need to buy it. But, I suggest to purchase it as soon as you can. Otherwise, you may someday be looking for a plugin, with long time of google searches and later find out that you just needed to buy that package that contains all that you need.
It contains 100+ plugins and most probably one or more will be useful. It's like a gold mine, finding those for a cheap price. Good luck with your game development.