That's interesting. They confirm a specific hotel right after you confirm you want it and pay? I mean, on the spot? Or they send you something at some specified later date with that info?
I ask because if it's the latter, well then you could see some logistical benefits in the extra time: checking with various hotels, shifting arrangements around, making more efficient use of the space at all hotels, etc. But if it's the former, well then I'm not sure what the benefit would be to keeping it a secret until you fork over the dough. Unless it's (1) because they're afraid you might not book if you see the exact property, or (2) they are trying to hide discount rates from other representatives of the property (agents), although they could probably find that out very easily, anyway...