if you are a frequent visitor of the buffet, why don't you apply for the dining club membership? the member will have free buffet everytime he dines (4 hotels in total), plus you have a set of 4 dining coupons (buffet), each for 2 persons at each of the participated hotels, plus other benefit.
-->Dining Club<--
you can check out details from ESD website (click above link) or you can call the hotel and they will direct you to the appropriate department.