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Shido could meet the expectations of so many people around him, and this is what allows him to survive in the harem.
There are also other aspects of his characters which allow him to stay in this harem too, but this patience would have to be a big factor for so many people to stay beside him, and be contented with it.
The expectations that both sides of the gender have with respect to the relationship comes into the argument now.
The main character himself is a major factor, as he is often patient enough to the girls around him.If the main character did not have sufficient patience, it might instead result in the harem breaking apart, or him bailing out and running away from the situation.