You cannot. Any website or individual promising to duplicate your items is scamming you and trying to gain access to your account or personal information. Never believe these scams.
You can't duplicate items unless you use a gameshark
You can't duplicate items in Pokemon. Only if you have the Action Replay or GameShark, then you can.
There is no way to duplicate items in Runescape. Although there was a bug once which did allow a person to duplicate party hats, this was quickly fixed.
No.
You cant
Yes, You keep all your items.
You do not receive Gold from buying a Cash Card but you will receive Gaia Cash. Gaia Cash can be used in all the main shops [Durem Depot, Barton Boutique, etc.] as well as Gold. The only main store that only accepts Gaia Cash is the Cash Shop. There you can buy evolving items and other rare items. Gaia Cash cannot be used in the Marketplace to buy items from another user. To receive Gold from Cash Cards, you will have to purchase items with the Gaia Cash and sell those items in the Marketplace for Gold [you will have to wait a week because items purchased from the Cash Shop will be locked to your account for seven days to make sure the order went through]. Prices are as follows: $5 - 500 Gaia Cash $10 - 1,000 Gaia Cash $25 - 2,500 Gaia Cash $50 - 5,000 Gaia Cash
If you mean the tickets from the casino, you can use them at Prize & Joy in the Gaia Shops to get different items.
Dompster
no
Don't think you can
No, you can only buy Gaia Cash. Gaia Cash can be used to purchase rare items through the Cash Shop which often sell for high amounts of gold in the marketplace and Gaia Exchange forum. In this manner, you can convert money to Gaia gold, but it avoids the issues of massive inflation by using the cash as an incentive to get other members to give up their gold (for the rare items).