Back about 10-12 years ago or so a bunch of P7-PSP pistols came on the market, German police trade-in pieces that HK ran through their shop for inspection and sold with limited warranty. Depending on condition (mostly holster wear) the prices ranged from mid-$400 to upper-$500 range.
I experienced a spike in demand for holsters, so I entered an order for a mid-grade pistol. Received it soon after, in factory box with manual in English, cleaning tools, and spare mag. Cost me $577 delivered at the time.
Used it to make dozens and dozens of holster orders, more than paid for itself in a few months time. Demand tapered off as the marketplace absorbed the flow of pistols, and the P7-PSP spent several years taking up space in the gun safe.
Not the easiest pistol to make holsters for. Short overall length, relatively heavy, and nearly all of the weight concentrated in the grip-frame (especially when a loaded mag is in place). Any holster design that contains enough of the pistol to provide positive retention can provide challenges in accessibility (ease of draw with a solid "shooting grip"), particularly with the squeeze-cocker situated as it is. I'm not attacking the P7 design, just commenting on it from the holster-maker's perspective.
Took it to the range a couple of times. There is a definite learning curve dealing with the squeeze-cocking mechanism, but overall it was an easy pistol to shoot well. Only complaint I found was the occasional blast of super-heated chamber gas through the gas port into the space around the trigger, thus frying my trigger finger once in a while. I understand that this issue was dealt with in the later P7-M8 series.
Anyway, after several years laying around unused in the gun safe I noticed that the P7-PSP pistols were bringing over $1000 again. I advertised mine on GB and quickly sold it for $1150, double my investment (and that was probably 4 or 5 years ago).
Great pistols, but not for everyone, especially not for those unwilling to commit the time and ammo to master the squeeze-cocking mechanism and use it effectively. For those of us who learned to concentrate heavily on trigger control the effort involved in the squeeze-cocker can have the effect of breaking your concentration (not especially good in defensive use circumstances).
Your mileage may vary.
Now, that Browning Hi Power is a fine looking specimen! Love it.