I'm going to exploit a restaurant's promotion to get free food out of the deal.
Why would you exploit the restaurant's promotion?
Because I feel like I deserve the free food and I spend quite a bit of money there.
I know you feel that you're entitled to get free food from this restaurant, but it's wrong to take advantage of the generosity of the restaurant. You should only take what is reasonable and allows others to participate as well.
So I should assume that the owner doesn't want me to get some free food?
They are doing this to give you something to begin with, you shouldn't use it to pretty much steal from them. It's not right and just because you spend a lot of money there doesn't mean they owe you anything.