Indeed.
No, it doesn't. And that no extra cash covers no salaries for the SW team. So the new UI, and high performance features, and incremented version number has to be covered by the one time payment on new cameras. With the market shrinking, that's going to be less than you'd get from software companies that require monthly payments, or for each new upgrade.
Yes, but those lost parts don't carry a monthly expense on SW team salaries, office space for them to sit in, electricity to make their computers run, etc. They can calculate the average price of lost parts over said period, and add it to the binoculars' price.