Correct, excessive amounts of money. I have a LaserJet III for printing documents, why? Because it cost me nothing but some electricity to use it. The toner cartridge last for THOUSANDS of prints, and I find free spares in trashed-out LaserJets.
I have a SCSI card because high-end SCSI scanners are free now too. Anything USB under $200 can't compare.
I have a nice joystick collection: The new joysticks lack ergonomics found in a select few older models. Takes a joystick port, of course.
I can't afford the USB 2.0 to SCSI adapter that Adaptec just took off the market. I can't find a USB to Joystick adapter that's universal. But I can afford to adapt the printer to USB.
Heh, printer companies sell inkjet printers for free after rebates . .. Why ? because they make all thier money on cartridges 😉 One thing to note though, Color laser printers can be had fairly cheaply now ($300 ish). As for what you said about USB scanners being free, well, I dont know myself, but using SCSI instead isnt a very portable / universal way to connect to more than one PC.