I think it's nothing more than a homey kind of way of saying 'come in'. It's more suggestive of familiarity and super-friendliness, as is 'come on down', and come on up', and 'come on over', 'come on and dance with me'.
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VictorycountryHi,The announcer on "The Price Is Right" wouldn't sound half as encouraging if he said just "come doooooowwwn."; it needs the 'aaaahn' for effect.
Sometimes, I hear someone saying "come on in" instead of "come in". Is there any difference?
Thanks in advance.