23 cents a round doesn't sound half bad when primers are going for 7-8 cents each, powder is $50-$60 a pound and bullets are 8-10 cents apiece.
At today's prices it will cost you somewhere around 20 cents per round to reload 9mm (even assuming free once-fired brass).
For those who paid a lot less for their stock of reloading supplies in years past, it is still possible to reload 9mm for under 10 cents a round.
But there is still the question of how to replace those cheap reloading components from years past if you use them up?
These days it doesn't look like that is going to be possible any time in the foreseeable future.