You just tried to abuse science to back up the PUA-sh*t you preach on this forum and failed miserably by misinterpreting the article. Yes, the article says that the one who invests the most will also try the hardest to prove himself or herself to the other. However, that isn't a reason to invest the least in the relationship because first, the article says that it puts the other partner in a world of hurt and second the article suggests it's necessary to balance the investment.
So please, stop teaching and preaching this less emotional investment crap. It's pseudoscience: a misinterpretation of science that is used by so-called PUA's to sell their books and keep already desperate guys even further away fron girls.
Stop this fraud right now!