I'd like to put my tuppence to Paul Brennan posting.  I don't think
it's fair to say that player piano rebuilds are expensive.  They
are considerably cheap.  Just go to your local piano shop and see
what $20,000 gets you: not much -- listen to the tone!  They have
a too bright "in your face" sound.

When I do a rebuild I do the whole player action, piano action and
put my non-rusting strings on both bass and treble.  I am the first
producer of non-rusting strings, all of that for $6,000.  As most of
you would have seen the standard I set (on YouTube) you can tell this
is nothing but fair.

Steve Marx - Australian Piano & Pianola Factory
http://www.pianosandpianolas.com/