How are people getting deductions over 15000? The only big deduction item I can think of is Tradestation, which is only 3-4000 a year.
If you trade as a business you can deduct any dedicated computer hardware purchases and desk/furniture purchases. If you have a home office used for the business you can deduct a portion of your house payments, and utilities as expenses. You can take a fellow trader to lunch and pick up the tab as a business expense. You can wrack up expenses daily if you know how.