Pick and places are more than just one machine, it is a system of production. I know this as I happen to own a nice one at my shop.
For me, the machine was the easy purchase, the harder part was getting working pcbs off of it. You have so many variables in the process that if any are done wrong you end up just spending more time trouble shooting and reworking than it would of taken to hand solder in the first place.
Examples, application of solder paste. You can hand apply on individual pads, which is no faster than hand soldering. You can have a machine apply pad by pad, which is faster, but many boards quickly get to more than 100 pads so if the machine is only 99% perfect means you will have rework on every board. Or you invest into a much more complicated and expensive option of having Visual inspection machine that can spot these errors and correct them. But, then you run into the issue of pads that are too small to have a machine apply solder paste, this might sound unlikely, but most chips that require more than 15 pads are too small to have a machine we can afford apply the solder paste. So in that case you have to go with the production method a stencil printing the pads. This adds a cost of $150 plus to any job plus the need for a stencil printer. This is the best way to apply solder paste, the process is much like screen printing, fast and strait forward as long as you have good new solder paste. But, fresh solder paste is expensive, you want to buy it freshly mixed, there is a shop down from the old Dms that will mix batches fresh for you, they tend to be small bulk packs say 1 to 2 lbs each and run more than $100.
That is just dealing with solder paste, not even talking about buying components in quantities needed to be able to feed in the machine, or dealing with placement, bad components reflow ovens, or cooling. Using pick and places are strictly for production environment, they don’t have the over lap into prototyping that other tools like the Haas, Cnc router, plasma cutter, or other tools we have around Dms do.
My two cents spending 2+ years building a pcb production system and spending $40,000 plus on it. Ps I still don’t have it figured out for more than one product.