Your point?
First off, not all cases of Bxh7+ are Greek Gift Sacrifices. Secondly, the Greek Gift Sacrifice doesn't always start with Bxh7+. It could also start with ...Bxh2+, or in more rare instances, Bxa7+ or ...Bxa2+ if one castled long, moved the King to the b-file, and the Rook then to the c-file!
Secondly, what does the Greek Gift Sacrifice have to do with Openings? Re-read the Forum subject - Forums >> Chess Openings!
There is no Opening Variation that features a Greek Gift Sacrifice. By the time it comes up, you will be well into the middlegame by then.
You also can't tie the Greek Gift to any one specific opening. It can happen in just about any opening where the King Side is not fianchettoed. This can happen to Black in the Colle System, French Defense, or Owen's Defense, just to name a few. With White, I've had it come up once in a French Defense (I was Black), and I've seen it in many other openings where the Light-Squared Bishop is developed classically.
http://www.chessgames.com/perl/chesscollection?cid=1001821
This is a collection of games featuring this theme.
1 e4 e6 2 e5 d5 3 d4 Bb4+ 4 c3 Nh6 5 Bd3 O-O 6 Bxh7
This is a retarded sequence of opening moves
Yeah but it proves it can happen in an opening
It doesn't prove anything. This does not belong in the openings section.
Devil's advocate. I believe there are lines of the French where the Greek Gift is part of the theory. White sacs, Black has to sac the Queen back for a Knight to avoid checkmate, and the game is surprisingly even. That said it's not as if people are actually posting that kind of thing here.
1 e4 e6 2 e5 d5 3 d4 Bb4+ 4 c3 Nh6 5 Bd3 O-O 6 Bxh7
This is a retarded sequence of opening moves
Not to mention, this isn't even a Greek Gift Sacrifice in its true form, and 6.Bxh6 is far stronger!
The closest thing you get to a Greek Gift Sacrifice in the opening is if Black blunders in the Classical French:
Bxh7+