You're not going out and saying, “Please, would you sponsor your spouse, because we are short on spouses”; you're not saying, “Please, would you sponsor your parents, because we're really short on parents this year, and I'm not going to reach my target.” You actually have a big pile of them ready to go, and you filter out what you can filter out, based on some kind of a triage, I assume.
I have to explain this all the time to my residents who are trying to sponsor someone. They say it's processing time. They blame the bureaucrats.