No I don't really think we shall all buy a Genos or a Tyros and the most expensive speakers there is out there.
I also believe there is nothing bad about buying new packs of styles and sounds.
But while I can see that many people are not familiar with their keyboard's abilities and functions, that doesn't mean that someone may take advantage of it and claims that he will make their keyboards sound just like a Genos without telling the whole truth and how this pack works.
Eventually all new styles of Genos will be availiable for other keyboards anyway.
People allready converting them.
The higher price of Genos included the new styles and the modified old ones that reworked and sound better on it.
If you want to make your keyboard to sound better you may have to modify/equalize/edit every single part of every single style and voice to suit with your taste and the song you are playing.
While this is a hard work to do,there are also others who do it and they sell their work the right way.
They sell packs,styles,specific song styles,voices,registrations but they have a url page,paypal option,demonstrate their work etc