It's silly to get involved in a religious/political/opinion dispute. What carries the day is supply and demand. If it is financially of interest to the shop owner to get the additional clientel caused by the certificate, then they will. If not, then they won't. Why get more complicated than that?
Suspect Bangkok bomber arrested, found with possible bomb-making materials (Reuters)
from the article: Jerusalem eateries revolt against rabbinate's kashrut inspectors