One half of one percent is just about the same as the house edge in blackjack.
Now,if you file taxes for the next forty years,and each year you have a half percent chance of being audited,what are the chances of being audited at some point in the next forty years? Also,keep in mind that when you are randomly audited,they often go back three years.
btw-small businesses and their owners tend to get audited more frequently than standard returns.
You can deduct this years losses from this years winnings,you can't claim losses from earlier years.
There is a seperate schedule you use to file gambling win/losses.
There is also a tax catagory for the professional gambler,that will allow you to deduct your travel expenses,but the rules are extremely rigid as to who can use this.
There are several books out on the subject. I recommend Jean Scotts.Don't have the title in front of me but it is sold at most web gambling sites that sell books.Pretty sure its available at The Las Vegas Advisor bookstore.
Hope that helps.