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Really? Is there a specific reason for this? Is this only saved for the pricier models or something? If so, is there a possibility that the lower end imacs receive this ability later on?
 
why cant the adaptor be used on the 24?

Because the 24' iMacs display output can't be used as an input. Simple as that.

Really? Is there a specific reason for this? Is this only saved for the pricier models or something? If so, is there a possibility that the lower end imacs receive this ability later on?

Not only because of what I said above, but because the 27' iMac is a newer model, therefor it has newer features
 
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