surely the less successful the product, the bigger the price drop? the manufacturers have to recoup some of the fixed development costs if it is not selling, so cut price to get some more sales. if the product is selling successfully, there is no need to discount heavily. every price drops when replaced by a new model, so success is measured in the time before price drops come in. with the mz that was soon.
the example of the full price psr8000 is just a retailer relying on customers ignorance in not knowing what they are buying...
sorry to read about your 2000 chip saga, it must be frustrating to say the least and spoil the excitement and energy you get from the adventure of a new board to play.
2000 versus 2000??
you have to look at your local prices, but I would say the yamaha wins the voices, harmoniser etc, and although the psr operating system has improved, there are a few tricks in the mz that are worthwhile, in the ease of use department, so it is not totally out of court in comparison. but for me the voices count a lot...
as far as value - I have said every time this is the last time I buy at launch - next time I wait until it is about to be replaced and get it cheaper - and then you listen to it, get enthusiastic, play a little music, hear some great samples, see the improved features or editing... and all the good intentions go flying out the window...
go figure
ps my first full size, top of the range board was a casio XXX7000?, maybe 20? years ago, before the days of digital, samples, FM?, midi???. This was a huge grey beast with a few patterns and a handful of voices. The best voice was an analogue electric guitar (v.e.r.y... fender/wet reverb) so I used to play virtually every song with this blasted electric guitar!!!