Disklavier

I'm a newbie and was wondering if anyone else is as frustrated as I 
am at the lack of Original Artist Music Software for the 
Disklaviers. Could someone explain what the problem is and why this 
cannot be rectified? Why can't any Artists make money off of 
Disklavier Software just as they would if they sold a record?

I am quite disappointed after purchasing my Disklavier that artists 
like Billy Joel, Elton John, etc. have PianoSoft titles out but 
performed by some other Pianist who naturally does not have ANY of 
their style and/or sound. This seems true of the majority of music 
available for purchase.

Does anyone know if it's possible to convert/format Commercial Music 
CD's to be able to play the actual piano parts on the Disklavier?

I understand there are PianoSoft and PianoSmart CD's available but 
this is also either very limited or using another "play along" 
pianist's performance with the actual commercial performance and not 
the real original artist.

The closest I have gotten so far to hearing pure artistry from my 
Disklavier has been from the "Gershwin plays Gershwin" Software that 
was actual Piano Rolls performed by him and converted to Disklavier 
Technology. There must be others???