I live in a culture where we stay together with your spouse, as well as your parents for majority of your life. Both of my parents have been diagnosed with non-curable cancer (late last year). My expedite was for two reason 1) To assist my spouse with her mental health, so she can be treated here. 2) She can also take care of my parents/live with them as they do not have much time. Neither can they travel in such condition to see their daughter-in-law, and neither can the daughter-in-law come here... Things are going to go down-hill with their health before my spouse's petition is even approved.
I wouldn't necessarily call it odd*. Mental health is a problem in 1st world countries, just imagine how it must be in 3rd world countries... But I think the consensus from this forum is just to wait it out as expedite won't do much good.