<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by Tango:
If all upgrades are in C or Z class, why would an agent care how the passenger got the upgrade as long as it is all in order?</font>
Because the passenger may be of the sort that will only travel in a premium cabin, and would have otherwise bought a full-fare ticket had an upgrade not been available through a broker.