A question on runescape spending?

Due to the recent updates to the Grand Exchange and to the game itself, there really is not a good way of "making money" anymore. When i played i fished, for shark and such, i currently have a fishing skill of 93 but i quit due to the updates. i made 30m from it. but since sharks are merely 500gp at the most, its not a good source of income. Most people make money by gambling using the "dice game". I have many friends who have made a killing from this( like 200m+). this can either make-or-break your bank. In all honesty thats the only real way of making money fast anymore.