When the price per key drops I'd be interested... but http://www.thinkgeek.com/computing/input/88ee/ is 3 keys for $135... or $45/key... the full keyboard with 113 keys is only $14.15 a key... which is a lot better but still a tad over the top...

Bring the price per key down into the $1-3 range and these things will fly off the shelf. I'd happily pay $200 for an x-keys pro with this type of key cap... it would certainly solve the profile issues I have now of trying to remember which mage spell is my shamans lightning bolt!