That was one of the gimmicks to attract more customers, possibly created by Dao Heung Seafood Restaurants, HK,with conditions applied undoubtedly, the ad.was about ‘Yat Mun Gai= $1./serve’ for the chicken dish, but you had to order a certain dishes of other food, eg. If you have ordered 4 ‘regular’ dishes as expected,then a dish of chicken would be charged just for $1. ,no guarantee how big of the portion, some other food items were being used like lobster, a barramundi or bbq meat platter, and shark’s fin soup too, there was the ‘bait’ to hook the fish (diners). Even free of charge for that extra food as complimentary. You couldn’t order the cheap-Charlie as just spend a peanut of money and get the ‘sweet’. They never worked for nothing, that’s business.