9's may be cost-effective when it comes to brass, lead, & powder. But you have not lived until you send a bunch of 255-300gn big guys down range in a 45LC version gun. I do not worry about the cost of the lead.....have plenty of it. I would rather use it on some real big boolits than just sending tiny little peas to visit the target to hear a gun go bang...bang.
I have several friends that just love their various brands of 9's. I have shot them all and just do not get that famous "thrill up my leg" as I do with 38's and big 45LC's. (not to be confused with shooting one's self in the foot!)
But to all those 9 lovers out there, glad you have your piece of heaven! I sure see a lot of 9 brass at the range. It just does not fit my needs.
Good shooting!
banger