For sports, we know that at least 30% of the tickets get resold, so it's easy to figure out. It's millions of dollars per team.
For concerts, it's a little more obscure and the numbers are more dramatic. The prices are sometimes very high, compared with the face value. Of course, the tax component comes into play, because a lot of these entities don't collect the tax on the upside, which can represent a fair amount of money.