The problem isn’t the manufacturer or the operator, it’s the middleman looking to make a profit on the the difference. In any case $800 is an absolutely ridiculous price point regardless of liability. I don’t know where the fair price point is but not even close to that. Liability isn’t the primary driver for the cost anyway, it’s difficulty of certification. Getting any part certified runs from high 5 figures to many millions of dollars and these are all extremely low volume parts. Boeing has only made around 11,000 737s since 1967. The plane I’m working with now only has around ~250 built since 2015 and is quite successful. For comparison Toyota produces about 20 cars per minute. When you need to pay back certification costs and turn even a modest profit on such low volume you need to charge a ton for each part.
To be clear I am absolutely not in support of non certified parts, it’s just a big problem in the industry and for rather obvious reasons.