When abbreviating, the singular or plural are abbreviated the same way. That is why you go 60 mph, not 60 m'sph. 
That is why technically it is RBI.
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Originally Posted by bluezebra
When using the initials, RBIs is proper. Try saying RsBI.
Bob
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__________________
Well I am certainly wiser than this man. It is only too likely that neither of us has any knowledge to boast of; but he thinks that he knows something which he does not know, whereas I am quite conscious of my ignorance. At any rate it seems that I am wiser than he is to this small extent, that I do not think that I know what I do not know. ~Socrates
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