don't bother for now . . . (LW has generously made the Free really good), but think about "leeching."
Take a few hours and read through the links on
http://www.limewire.org/ to get a sense of all the volunteers around the world helping out the 'paid' LW team. We "leech" off all that work, so think about how we can help out.
If you have $, that helps. If not, think about how else you can help do something that helps the project along.
Hey--you're young enough! Learn to code java
(all the code is freely available to build your own Pro version).
Bottom line from an old guy? Take what's offered freely, but think about how to get where you can help others even more than you were helped.