I've just come across and finished reading this thread so I'll add my 2 cents (and some change) about Debbie.
1. I don't think she is or was ever after the children.
I mean, what would she do with them anyway? She doesn't know them, she said herself several times she didn't want to have any of her own, she's not the motherly type, she had them because she wanted Michael to be a father and the most telling, she gave up all of her parental rights.
YES, I know that the court overturned those documents and her rights were re-instated, BUT that says nothing about the INTENT of her actions, which was to give them up. If those filings had gone through she would not have any input to present in a court of law.
She should thank her lucky stars for whoever fudged the paperwork.
2. I don't think she's after the money.
Michael paid and continues to pay Debbie well for doing what she did for him, which was be a supportive good friend over the years and birth two children for him. That said, I don't think she went into the whole thing with money on her mind. Of course everyone needs money to live, but it's not like Debbie was living on the street when Michael met her.
She was an independent woman who was working and supporting herself in her profession. Add to that that she didn't come from too shabby beginnings herself, and also, you can take one look at Debbie and know that she's not a high maintenance "glamazon" by any stretch of the imagination...especially, not by Hollywood standards.
3. So what do I think Debbie really wants/wanted?
In my eyes, Debbie didn't have those kids to have kids and she didn't make the offer to have kids to "get paid" as so many seem to want to think.
I think she did it because she genuinely wanted to make the object of her love (MJ) happy. In that light I see what she did for Michael as extremely SELFLESS....She gave up the use of her body, meaning she could have DIED in child birth. How many people can say they would do that for a friend?
At the same time though, I see what she did as extremely SELFISH because SHE never wanted those kids at all, it was 150% for Michael, and I don't care how good of a friend someone considers them self, "gifting" children in the way that this was done is just not normal behaviour.
What I honestly believe...
is that Debbie did this for Michael knowing in the back of her mind that it would forever connect HER in some way to HIM. I think that to this day she gets a lot of satisfaction in knowing that SHE helped create those two kids and no one else.
She has said several times on camera that if "the marriage" ever came in between Michael and her "friendship", she would give up said "marriage" in favor of the friendship immediately. And this is exactly what I surmise happened.
They were indeed very good friends before the kids and marriage and I think after that situation changed something between them also changed.
I DO know that the "marriage" was dissolved, Michael kept both kids, Debbie's subsequent visitation was kept short and supervised AND she was eventually asked to give up her rights to the kids she helped produce, which she obliged.
And I said all of THAT to say THIS...
To me, her goal was/is not the kids....any money....or fame....but simply Michael himself.
It's clear to me that Debbie was IN love with Michael at some point (most likely still is). And for whatever reason, that love doesn't seem to have been returned over the long run as it appears that by the end their relationship it was exactly opposite from what it was at the beginning. They started out as very close friends and ended up MILES apart both literally and figuratively.
I don't, and will never vilify Debbie because I've said it before and I'll say it again, she gave birth to two of the three TRUE loves of Michael's life and NO matter what the background story is how they were brought into this world (and for the record I believe these are Michael's children), there is no question in my mind that they were the complete and utter joy of his life.
For that I thank her profusely and forever from the bottom of my heart as a humble fan.
In the end though I believe Debbie ended up both winning and losing in her decision to provide Michael with her "gifts".
She won because she will through those kids have a connection with Michael forever that no one else outside of his family can EVER claim.
She lost because I think if she knew that her close friendship with HIM would have gone south as a result of what she did (with him eventually barely/never speaking to her and her not seeing him or the kids for years at a time) I don't think she'd have ever "gone there"....She loved him way too much.