(I'm beginner) 1- Can I buy/pay the whole contract price without margin (the broker will have no risk at all then- no need for maintenace margin) ? 2- Is this borrowing money so I need to pay interest and regular fees? if not; What does the broker benefit from it? 3- Is the margin calls money I pay unrecovered so I lose money every margin call?
Once you take a contract position, you can win or lose generally an infinite amount of money. The price you pay to get in to the contract has nothing to do with anything. Once you are in the contract, you can win or lose generally an infinite amount of money. Margin sits there to cover you when you lose.