It's funny I have actualy heard this before with one difference: The previous one was a themed world, not the game. Although it would be fun for a while, everything gets old. Plus a lot of people don't like being balanced therefore making it challenging. I'd play still.
Well because hardly anyone is actualy helping you here are some of the classic ways: Mining Pure Ess, you need to do that one quest. Just mine it and bank it then sell in GE. Running flax. Same idea. Both are incredibly boring but ok money I guess.
If I never found RS I would probably have more friends. Also I would probably have a girlfriend. Also I would just play Guild Wars or WoW. Yeah I like my life as it is thoUgh! =P~