The P is a superb camera with all geared movements and very nice asymmetrical base-operated axial tilts and a yaw-free design. It is also very heavy and bulky. It's great for the studio, and was a favorite of product photographers before they all went digital (the P3 with a digital back might still be a favorite for those with a lot of provender).
Whether you can get your money back depends entirely on how much money you put in. My sense is that parting it out might make more than selling a whole unit. I don't follow the prices for a P--I have no need for something that heavy and bulky however precise it is.
Everything Rick said. I added a Sinar P to my Shen-Hao Field for portraits and "Explorer Adjacent" outdoor photography. Great camera to play with. As a completly modular system, it is sure to keep you poor forever. Value should hold if you buy "right". Highly recommend.
Sometimes you see them sell for less than $500 but bare in mind that the chrome Ps are going to be at least 25 years old and even in mint condition they may need service for lubrication and adjustment. Also many were used in high-volume catalog studios and used hard/put away wet. Some photographers, especially employees and not the owners, would over crank and hammer the controls. Also, since the cameras are modular, someone might assemble a kit from less than ideal parts.
(Imagine doing 20-60 shots a day with six-sheet brackets at $150-400 per shot, day after day - that was what it was like in the 80s - somewhat mind-numbing but quite profitable. Of course a new Sinar P cost what, the equivalent of $10K?)
Not to scare you or make you suspicious, but buy from good people based on condition more than lowest price. If you need service, Bob Watkins at Precision Camera Works http://precisioncameraworks.com/ in Chicago used to be a Sinar Tech, and also Sinar-Bron themselves still do a good job with service.
Otherwise, a clean Sinar P is like a rock. A Sinar P2 is a little nicer and I'd argue that Linhofs and Arcas may be better ultimate cameras, but it is hard to beat the value and versatility of the Sinar P in a studio camera.
Get the Sinar Pan-Tilt Head, it makes the system work so much better.