Allow me, then, to demand it
Originally Posted by Brian Shingles
That's something we might look at in the future if there is enough demand for it.
My family has been purchasing dozens of games on Steam for the past ten years and it has never experienced any problem whatsoever with the processing and the security of credit-card transactions from my dad's (family-shared) Steam account. Also, by activating "Steam Guard" the account is very tightly protected against intrusion.