[Tony Jay]

No brainer - buy it.
Find a standard pressure load that feeds and is recommended, then stash the PF-9 and ammo for a rainy day. Think of it as cheap insurance.
As to investment, one thing the stagflation of the 1970s taught us is that guns were a great hedge against inflation. In a few years that price should double.

 

[Tony Jay]

2 things:
1. Kroil works better than WD40. Amazing stuff. Ordering directly from Kano Labs is the cheapest way to get it.
2. If you intend on concealed carry for the PF9, having anything stickier than the original grip is not advisable as such modifications often "grab" fabric and reveal the pistol. Remember, the first rule of concealed carry is to be discreet.