Keep in mind, noboddy is selling/creating commercial sound packages for pa4x so far..
(Only a greek guy) but those are overly expensive, even compared to yamaha prices..

So to utilise all this ram, you need to create your own sounds from samples..
By utilising the Korg advanced sound engine..
To make quallity sounds, this is very very timeconsuming..
Hench the prices and the number of the available sounds..

Comming from pa4x, after 2 years my sample memmory was almost empty
It was much easier to use a PC for new sounds..
I guess Genos might be a different story with quite a lot of dowloadable packs..and also 1.8GB of ram..
But my main source of new sounds will be the ipad and mac..

Makes me wonder how many pa4x owners and previous owners had a lot of ram sounds in their pa4x?

The only people i know use this a lot are the non western people
They require sampled instuments for their most used sounds
But for western people the sound engine of the pa4x is strong enough to create pretty much the sounds you need from the availalbe sample rom..