Hollywood Casino, Aurora, Illinois

I'm at the roulette table when a guy from the black jack table, right behind me, comes to the table nad puts a $25 chip on number 27.

The maximum bet at the roulette table is $10 (I couldn't believe it. How wimpy can you get. First, last, and only time I went there.), so the dealer trys to get the guy to withdraw his bet, then calls the pit boss. The pit boss okays the bet. The wheel spins, the guy wins, he takes his $875 and goes back to the black jack table.

My question: Why is this guy playing black jack instead of roulette?