There is usually a spread, it almost always favors the IETF bookers.
This year the hotels offered with an RSA booking were the same as last
year with slightly lower prices. Most people book early because they
usually fill up quickly for RSA. When I booked my flight I was offered
the Hyatt Union Square, usually $250/night during RSA week for
$110/night.
Sure, it does happen, but my experience has been that the IETF hotel
is usually overbooked and there are no rooms left to make a
comparison.
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