"You see that toy that other store is selling at 15$? I can sell you one too at 15$ and I will even lets you use my tables (so other customers can see it played and kinda gives me free advertising), but only if you first buy 10 of them at 20$. Sound like a deal right?"
Table space isn't free. You pay for square footage. If a store is dedicating space for playing tables, they are giving up space that could be used to merchandise other products that directly make money instead of hoping that the space will generate sales.
