Also what if there was a fourth wish that rhymed with the kind of dish the man is holding? In result the fish turned into that dish because of the over-values handing.
The way these genies' rules could rule, is that everyone has to grant a minimum of 3 wishes at all times. It is by law thus required that every licensed genie carries that amount of wish-granting incredients on them. What I mean is that there is no 3 wish limit. If someone wishes the 4th wish, if the genie was carrying the required ingredients on him, it would be granted and the ingredients depleted. If there is no ingredients, the genie is consumed instead.
Just a thought.