Originally posted by DeadJohn Manufacturers brought this on by their own policies.
Staying on-topic, I'll use a repeating example with Ricoh. They only have one authorized repair center in USA and do not make parts available to consumers. So, when someone breaks a removable lens foot and needs a simple replacement part, the customer is forced to ship their entire lens and pay for a "lens repair".
Ricoh's policies are hostile to consumers. 70-200 "lens repair" costs $478; that's insane for a lens foot. Shipping the lens when it doesn't really need to be shipped needlessly risks damage to the lens. Customers can't use the lens for several weeks while it's in transit and sitting at the repair center.
Or, the aperture solenoid failure. In my case I was relatively new to Pentax, and KEH said they could fix my six-months-out-of-warranty K-30. Turns out they couldn't, because they couldn't get the part, presumably because Ricoh only sells it to Precision. So after about a month of shipping the camera around I got it back, still broken. Then I sent it to Precision. About a month later I got it back, after sending them over $200 to fix a $30 (IIRC) part. But when I got it back from them, they'd messed up the autofocus calibration to the point where the micro-adjust wasn't enough, so back it went to Precision to have that fixed.
So... it failed in early September, and I had a fully functioning K-30 back in December. All to replace a cheap solenoid that we now know can be done in a few hours by anyone with halfway decent patience and a soldering iron. Knowing what I know today I would have sourced the part on eBay and done it myself. But it would have been nice to have the part and some instructions from Ricoh before that whole odyssey started. I'd even have signed a worthless piece of paper stating that if in the process of repairing my broken-and-out-of-warranty camera I further broke it I wouldn't sue them.