Demos usually run out after a certain time anyway, especially pc ones... but if u wanted to, you could play f2p for your entire life if you wanted to! It's kind of like being able to play a ps2 with only one controller though - like as if all the cool 2 player games are the full version, but you can only play one player until you become a member. goofy, I know, but so is this argument! :P