Does electrification affect player piano value?  The answer depends
upon many things.  If the player has an electric suction system
installed in a non-intrusive way, so that the piano can be returned
to 100% original, then it should actually increase the value.

Some people use electrification to make a leaky player play reasonably
well.  We have all seen those.  There is nothing wrong with that, and
it allows the owner to enjoy their player piano until a rebuild can
be afforded.  The drawback to this is the high suction required to
operate the leaky stack, which will cause the roll to rewind at "warp
nine" speed unless a separate control is provided.  Also, the high
suction and leaky pouches cause the roll to suck so tight against the
tracker-bar that the roll tracker system cannot do its job.

Personally, I love to pedal a player piano -- I have more control over
the music.  If the suction kit is installed in such a way as not to
butcher the piano, it should not affect the value of the piano in a
negative way.

Andy Taylor