A company that formally remanufactures ammunition will have the test equipment and expertise to ensure it not only meets industry specs but will function safely and effectively in a wide variety of weapons. That's a much bigger trick than getting a load to function well in one weapon or even one weapon type.
I also don't consider "remanufactured" ammunition to be in the same categopry as "reloaded" ammunition as the remanunfactured ammunition will undergo inspection adn testing procedures to ensure it conforms to industry standard that reloads do not necessarily meet.
The local home grown reloader is not going to have that capability. I've been reloading for 30 years and I know an awful lot about reloading for an awful lot of rounds, but I would not claim to be able to produce high quality ammnition for whoever pulls it off the shelf, I cannot tell you the pressure it is running at or assure you it meets SAAMI or NATO specs other than in the broadest terms (OAL, velocity, component types, etc).
A larger company will also have a consistency in component suppliers that a handloader cannot duplicate. And, if things do not go well, they also have liability insurance and a reputation to protect. That would be important if a faulty round ever sent pieces of your bolt carrier down through the magazine, bent your upper receiver, etc. A reputable business will take care of the problem and even recall the suspect lot, while joe the handloader will probably forget he ever knew you and/or will claim it was something other than the fault of his ammunition.
What a local custom handloader can do is a develop a load for your rifle that will shoot very accurately and function safely and properly in your specific rifle. Beyond that, I would not recommend anyone go that route.
As for cost, .15 cents per round is cheap, but for another dime you could get reliable ammunition from a known source. From personal experience, I can tell you that a cheap round (surplus or otherwise) can cost a lot if/when something goes wrong. It does not take much in terms of parts on an AR to far outweigh any cost savings. If you have a pressure related catastrophic failure of a case head, you are looking at a new bolt and bolt carrier assembly at a minimum.