When you play as a free RS player without any runescape membership, you can only play in non-member worlds. You will not be able to enter to play in member world. Well, that means you will miss a lot of fun in member line. Not only about this, but also you will not be able to use the member armors and weapons. There are many rs items which can only be used by RS members, so if you are a free player, then we will be sorry to tell you, you will miss a lot of fun again due to this.
But it will not make any difference in leveling up your characters as a free player or a member. You will get the same amount runescape gold amount if you play very hard. But if you are too busy with school or work, you can consider playing with runescape bot when you are studying in school or working in the office. But to use bots is not very safe since runescapegold2007 does not allow players to do botting, it violates their policy. Due to the fact that botting can bring a lot of rs gold, many players still keeping using it.
If you do not have enough cash to pay the membership, please do not worry, because you can use your rs 2007 gold to exchange bonds in game with other players, and then use the bonds to exchange the membership directly in runescapegold2007 store which is very easy. So play hard in game and get as more gold as you can, then you will be able to enjoy the member benefits all the time.