Harry Potter and The Deathly Hallows Part 1 and Part 2

Looks like Warner Brothers and crew have made up their minds and the final Harry Potter book will be split in to two movies. The titles of the films will simply be:

"Harry Potter and the Deathly Hallows Part 1"
"Harry Potter and the Deathly Hallows Part 2"

The release dates planned are November 2010 and May 2011, respectively. Apparently J.K. gave producer David Heyman her blessing of good luck and is quite alright with the final book being split in to two films. David Yates will also be returning to direct the final film(s) due to his popularity with the cast and crew. That's fine with me. "Order of the Phoenix" was the best one of the lot and a major relief after the lacking fourth movie.

I'm not sure how I feel about this anymore. At first I didn't mind, but my significant other, who is a huge fan of both the book and movies series, thinks its rather pointless. "Order of the Phoenix" was the longest book, why wasn't that split in to two movies? Money you say? Well according to David Heyman the decision to split the final film in to two movies is "purely for creative purposes." Then how do you explain this? quote:

"The question will be, where do you break it?" says Heyman, "And how do you make them one but two separate and distinct stories? Do you break it with a moment of suspense or one of resolution? These are the interesting challenges. But each book has presented its challenges."

I have a better question, if you don't know where you're going to split the book, don't know how to make both movies in to their own stories, and don't know how to break the moment of suspense and gain resolution, then what "is" the creative purpose behind splitting the book in to two movies? If there isn't a problem with telling the entire story with one movie, but there is a problem telling it in two movies, why bother? Sounds like this "creative purpose" stuff is a load of crap to ease the hearts and minds of fans. I feel such a move could in fact be disastrous. (But the pay off will be nice for WB.)