Assume you travel regularly to Las Vegas for recreation. During a year you pay $10,000 in total travel expenses and win $8000 gambling. Assuming you have appropriate records, can you deduct the travel costs against the gambling winnings leaving a net taxable profit of $0? Does it matter if your winnings are mainly due to one big hit on a slot machine versus small regular wins due to card-counting at blackjack?
Assume, if necessary, that there are other casinos much closer to you than Las Vegas.