That's not a fair comparison, it would be more like if they run out of samples you can't demand more, or if you've already had 10 you might have to expect them

That's not a fair comparison, it would be more like if they run out of samples you can't demand more, or if you've already had 10 you might have to expect them to say no, or if you don't like the toppings, you can't really ask for substitutions.