It seems from a lot of responses that a balancing act is going on.
Contrarily to popular belief, having sounds and styles that a persons like does not necessarily mean that they would buy the keyboard regardless.
For example, just look at the issue of colour. If a keyboard has great sounds and styles and an OS that you like but the keyboard was silver or black you would probably still buy the keyboard. However, if the keyboard were hot pink, some persons would reconsider the purchase.

Every one has their limit as to how much of a characteristic of a keyboard would they tolerate. I may prefer a 76 key arranger but would not buy a 88 key. Another may prefer 61 keys but would not buy a 49 key one regardless of how great the styles and sounds and OS are.