People tend to make relative calculations about cost. What I mean is that $200-400 (I assume you mean USD, not HKD) does not seem like much compared to the thousands you are spending on the ticket; but it seems absurd if you are buying, say, a chocolate bar. But in your bank account, $200 is always $200. If you are asking about it, you are not so rich that $200-400 is pocket change. You will not get $200-400 worth of extra service and better food. Save it for something really nice.