I had a similar problem. I used Google to sign in on digitalocean, then I changed the main domain in google apps and readded the original domain seperately on Google Apps. But probably because some kind of ID mismatch, I was now unable to sign-in on Digitalocean with the original e-mail address recreated in Google Apps. Password recovery didn't work either, for some reason digitalocean doesn't do password reset for accounts that were created using Google sign-in. I was forced to create a support ticket with digitalocean and wait.
I'm thinking that there is a similar dynamic going on in romantic relationships. There are people who choose a partner for other reasons beyond strict love or money. For example, you might want a partner who is at home and supports you and your work (traditional household model). In order for this relationship to actually support you, like ioseph said, a matching level of emotional investment is important. Otherwise you're too dependent on your partner and that won't work out in your favor. I hope I could clarify my train of thought a little.