End credit songs

Random observation from watching various movies - there seems to be a tendency in recent films which had the rights to a high-level-recognition-really-awesome-song to hold off using that song until the final credits... recent examples I can think of include the remakes of "Ghostbusters" and "The Magnificent Seven", which hold off their classic title tracks until the end credits, as well as the Motley Crue film "The Dirt" which doesn't use "Kick Start My Heart" until the end credits... I guess the theory is "we'll give the audience a real treat at the end to send them out humming and that'll help spread good word of mouth"... but surely it's better to use that song at the top of a film to start the whole thing off with a high? Like "Another Day in the Sun" starts "La La Land" off on such a high... so does the "Soul Bossa Nova" song in the first "Austin Powers"...