I need to make alot of money on runescape as a member... i really want to have full infinity... i have like 20k right now, i am mad >:(

Uhh... fish? get your smithing/fletching up and sell stell, then mith, then addy, then rune arrows untill you have enough money to merchant. (buying something for a low price, selling it for a higher price in case anybody was wondering)

If your really desperate you can always pick flax. You can make about 120k per hour if you go to the flax spot near the bank in the gnome village. I used to play runescape alot, and im like the only one who knows about that flax spot. Well, not now, but... well anyway, its near the bank place in the southeastern part of the gnome village. There is only one plant there, but its right next to a bank and saves alot of time. Just look on the world map for the bank in the gnome village. IT IS NOT the one inside the grand tree.