Been doing this (horses and casino jackpots) a long time without a formal audit. It's doesn't wash dollar for dollar. If you use software to do your taxes you can see the very little impact it has writing loses against wins. Furthermore, you need more than tickets. Legally, you need a journal showing each loss bet with date, time and amount as well as tickets. Did you have any winners while you were losing that 1K? That needs to been documented as well and then declared.
One year I won multiple trips to Vegas (APA). My LO sent me a 1099 because the amount was over $600. I tried to write that off as not true value coming out of a prize fund I paid into all year. The IRS got me the following year. While not an audit, I had to pay additional tax (approx $250) on the amount further reducing the net received which was a joke to begin with considering I got $925 for THREE trips. Sorry got a little sidetracked, but that one has stuck in my craw for a long time.
One last thought. This kind of 1099s are issued for cash or the cash equivalent of prizes won. For example, if you win $300 in cash, a cue and a jacket, etc. valued at $400, you can expect to receive a 1099.
Sounds right. What a nightmare!
It reminds me of a girlfriend who got on that TV show "Wheel of Fortune." She won a trip to Europe and a few other things. They taxed her on the trip to Europe, which was very high. A trip to Europe was something like $10,000, according to "Wheel of Fortune," and she had to pay a huge tax on it. She said she could have probably gotten the same trip to Europe herself for the money she paid in taxes.
Meanwhile, I was in Atlantic City about 20 years ago, waiting for my friends to finish rolling the dice. I was bored and went to a slot machine. I really don't like slots, but it was something to do. I hit the jackpot for $1,400, I think it was. They had me fill out the tax form right there on the spot and took the taxes out for me. Strange.