I've come up with plenty of ways to make money and am only going to list a few here.
1. Put a bounty on your head for 1 million. People will be trying to add you like crazy to their friends list. When they add you talk to them about your bounty and say you will let them kill u for half the bounty and they must pay first. Let them pay you and just laugh. As you get more cash, increase the bounty's.
2. Look for noobs who don't know the prices of good selling items like cases, tell them most are worth 100k and buy all of their cases and put them on your friends list and tell them to sell all their cases when they get them to you.
3. Buy a pet, go afk in a noob area with your pet out, let the pet kill everything and buy a book of telekenisis through the hero tavern if you have any nCash and come back every hour to feed the pet.
4. (2 computers only) make a second account and power level a guy to level 10. Give him all of your rare items and leave him up all the time to sell while u play on another account.
5. Scamming, not always the nicest thing and i dont recommend it, even though in the first method scamming happens. More ideas are making friends and borrowing money then deleting them. Entering guilds for money. Pretending to power level people. Be creative.
6. Merchanting, buying low and selling high. Might take a while

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7. Always open 5 elements fortune cases, you will make more then you loose.