I am to a point that if I enter a room and see a model busily engaged in whispers and no tips are coming through, I assume he is working for free that day.
Eventually he will learn to manage the room or go broke and move on.
I may sound like an ass for saying that, but realistically these models are here for an income not to whisper sweet nothings back and forth for free in open chat. It is open chat for a reason.
I will step down from the soap box now. 
You hit the nail on the head.
I was just in a model's room.
I spoke to him and tipped him twice.
He barely spoke and completely missed my tips. Not a word of thanks. He may have misfired thanks to someone that was whispering sweet nothings (literally, no tips)
Perhaps the main point of a model is to get privates but i usually lead up to a private with tips and small talk and then maybe some more personal stuff to get in the mood.
However, if the model is too overwhelmed with with non-tipping whispers to warm me up with some chatter, then I am done.
What am I supposed to do, just hit the private button blindly without knowing what to expect from the model? That's not my style.
Free whispers really suck for the reasons I mentioned above.
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