Add up the individual components that go into a Tyros and see what it would cost to buy them individually.
I have paid almost as much for a vocal harmony unit as a PSR2000 costs.
Consider in a Tyros you get mic processor, multi-effects processors, 2 compressor-limiters (one for vocals, one overall), sequencer, mixing console, style, voice and sound editing facilities, etc. Some of the newer keyboards now have CD recorders, direct-to-hd digital recorders (GEM)--the features go on and on.
Think of all the research and development that goes into putting these packages together.
Sure I'd like them to be less expensive, but the miracle is that they are as affordable as they are now!
DonM