What am I missing (casino bonus question)

[Jim Morgan]

On the Aztec Riches casino, they are offering a 100% match up to $100. They put the bonus in a separate account. That account has a $6000 playthrough requirement. After that, you can withdraw any winnings (but not the $100 bonus itself),

At no time do I see any wagering requirements in REAL money.

I have built my bonus account up to $200, so I expect to cash out a $100 with no risk

Have I missed something in the fine print. This offer seems as if it specifically tries to get you to take a no risk shot at making money.

How can the casino possibly make a dime this way?

Anyone out there done this one to completion?

Jim