Final answer:
Daily specials cannot be changed while retaining the special price because it is against the rules and undermines the purpose of the special.
Step-by-step explanation:
The reason someone can't make any changes in a daily special and still get the special price is because it goes against the rules set by the restaurant. The daily special is designed to offer a specific combination of dishes at a discounted price, and making changes to it would undermine the purpose of the special. In addition, making changes to the daily special may result in increased costs and complexity for the restaurant, which they want to avoid.