Ken,
It's just plain wrong to take advantage of Hilton for such an error.
While some may argue that United's $27 fare to Paris was promotional, you certainly can't say Hilton was offering a free night, just like this. If Hilton advertised $0 for the first night, and regular rate the 2nd night, that would be ok.
Ken...this discussion (or at least a variation of same) was discussed once upon a time. Maybe you're trying to boost your post count buddy.

wink
Getting back to the discussion at hand: some of us are guilty of taking advantage of the system; some of us are guilty of abusing the system.
The real question here is how many of us are guilty of one of the above? My guess is most of us are guilty of something we've done. My guess is the excuse would be, "Oh, it's only miles (or points).
Come on...admit it.
Dan