To my way of thinking, the only reason to buy a stallion is to stand him at stud. If you plan to do that then you need to spend a great deal of time researching bloodlines, what crosses with what, and how to successfully and safely run a breeding operation. Then you need to start searching for the very best horse you can get you hands on for the wad of cash in your pocket. Then you will need to spend a great deal of money promoting this animal to attract mare owners. And then pray that mare owners will beat a path to your door.
A responsible breeder wants to put the very best foals possible on the ground. With all the unwanted horses out there now what is not needed is more added to the supply. Breeding is very serious business. It sounds like you have a lot of homework to do.
But if you want this horse for a pleasure mount, buy him, geld him and enjoy him.
Have you ever owned a stallion? Magnum Pshyche horses can be a little hot and as far as I'm concerned flooded with that breeding. So not only will this stallion be running against every other arabian in the breeding shed, but he would need to beat out most of this breeding in the looks, temperament and athletics dept. Owning a stallion is a huge responsibility I hope if you buy it you know what your getting into. I didn't when I got mine and it was a disaster, please learn from my mistake.
My honest opinion is 12K for a stallion is alot to spend in todays market of so many unwanted horses. Think someone is living a pipe dream. So many good quality horses need homes then to go out and by a stud. JMHO