It's more about sustaining the business. Redhat's most recently reported quarterly earnings growth was negative. Did they sell now because IBM approached them with an absurdly high price? Or did Redhat executives need to shop around for a buyer, because they felt they were near a local maxima and things were starting to go downhill?
edit: that said, this is a subject I care about and will be adding your podcast shortly. Hopefully you figure out podcast sustainability as well =)