The 25$ pp is subtracted daily from the total and can not be accumulated as stated above.
The continental breakfast (pictured in this thread) is 25$ with tax and is the option for anyone who wants to get a totally free breakfast (excluding tips). All other items are charged excluding tax but the credit can be used for both tax and tips. A normal breakfast (a coffee is 8$) will add roughly 10-15$ pp to the bill after the 25$ credit has been used. This is a great benefit and if you skip breakfast you can take a cocktail instead - very Vegasy.