Old School RuneScape is an awesome MMORPG for many reasons, not least of which is how much you can do as a Free-to-Play player. It's a better investment of your dollar and time to get the feel for the game and make the most of the F2P content. Afterward, splurge on a membership....
You can either choose to spend countless hours on a monotonous, tedious grind to make GP in the game or simply purchase the gold you need to have fun. The choice is entirely up to you, and it depends upon if you actually value your time, spending a little bit of money here and ...