That seems to be the big reason these offers are bought; another reason is that some people aren't necessarily good about determining that the value of the additional items exceeds the cost of procuring the same items separately while going for the lowest comparable rate (i.e. minus the additional items); another reason is that some people people behave as if they value predictability more than they value an accurate assessment that determines that the value of the additional items equals or exceeds the difference between room rates. [Gift card recipients/users are in that latter category quite often.]