Boesendorfer has a long history of fitting player systems to their
pianos.  First came the Ampico (around 1920s), followed by Wayne
Stahnke's SE system during the 1980s, replaced around 2006 by
Boesendorfer's new CEUS player system.

If I had a Boesendorfer, I would certainly fit a player system to it.
I've had considerable experience with the Boesendorfer CEUS system,
and can assure anyone it's fantastic and doesn't damage the piano,
whether new or old.  But you cannot buy Boesendorfer's CEUS system and
fit it to an old piano.  Instead, there are various options, such as
the Stahnke LX system (my pick), or the PianoDisc, and possibly others
I'm not aware of.

Regarding the effect of a player system on the old instrument, go for
it, I say.  Boesendorfers are built like tanks, and the sort of use 
a player system will give it will not stress it any more than a live
pianist.  Player systems all have a volume control, so you can turn it
down to almost a whisper.

As for resale value, I wonder what the piano is worth now. Add a player,
and it must surely be a more attractive instrument for resale, but
who'd sell a fabulous instrument like that anyway?  Showing my piano
preferences, I guess...

Peter Phillips
Padstow, New South Wales, Australia
http://www.petersmidi.com/