Nah, I already got the 24,99 family plan that includes 500 premium clicks every month. I just hope they don't follow through with their crackdown on account sharing.
When you click a button it's actually two events, a button down and a button up. That is how you are able to grab something and move it, by clicking and holding and then later releasing.
Premium clicks include both the button down and button up events. Non-premium clicks are button down only.
Remember to unclick your buttons if you're not paying for premium clicks. You wouldn't want to continously keep reordering toilet paper from Amazon, would you?