Some people perhaps choose to post it because they enjoy the interaction and it also suits some of he regulars as it gives them to answer within seconds of the clue being posted. It probably suits the Ed too as it boosts the usage figures. Related Questions often shows that the same clue has been asked lots of times but posters don't see that until after they've posted.
Anyway, it's possible that for every 10 people who asked for the answer to 'put into effect' there were far more than that who found it from the search box- we don't see those