I'm guessing this is in fact considered taxable income. If you're going to end up with a $3000 tax liability and you can probably only re-sell the thing for half of what it is truly "worth", this is almost not even worth it.
Or you get a $6,000 watch so you only have to pay around $1,200 in taxes. Not sure I'd spend $1,200 on a watch but it might be worth it at that price. Or I could sell you my fake Rolex for $50.