Some possibilities:
If going to another state with a straight wall rule.
If they wish to hunt using an AR15.
If they want a bolt gun in a light recoiling round for 200 or less yards.
They just want to try it.
Marketing/hype.
Ammo availability.
Gun availability.
Personally, like kandpand mentioned and as listed above...I'm a rifle looney and hunter that likes to try different things. I could pick any one standard round and hunt with it the rest of my life...but if everyone did that, there'd be no need for folks to run gun shops like you do!
