When my agent made an offer, I let other agents reading know, and only one other agent asked who it was that was making the offer.

I'm pretty sure that, as Harlequin says, this is sometimes asked just as a way to verify this isn't trying to accelerate/fake a representation offer. Many of the agents do know and interact with each other, so it's not really a big deal to "Trust, but verify."

It's sad that we've gotten to the point where agents need to check to see if an offer of rep is actually real, but there have been some pretty well-documented instances where desperate queriers have tried to game the system by faking an offer and letting other agents know, in the hopes of jump-starting a real offer of rep.