But no one has in spite of there being a super strong incentive to do so. Reuse is taking over the launch market. And for good reason: expendable aerostructure

But no one has in spite of there being a super strong incentive to do so. Reuse is taking over the launch market. And for good reason: expendable aerostructures cost basically the same to build as reusable ones, certainly within a factor of 2 or whatever. A cruise missile and a similar dry mass general aviation aircraft cost about the same. For all the talk about (& investment in) low cost expendables, nobody has made it cheaper. Besides, reusable liquid rockets are easier on the payload (less vibration, etc).