Why do research companies put demographic questions at the end?

I usually like yoursurveys because they disqualify early and you don't end up wasting your time (coughswagbuckscough), but I just got disqualified from some survey all about rambo because they asked demographic questions at the end and they'd already met their quota for the group I fall into.

I don't get the thought process of putting those questions at the end. I mean, if they don't need my answers they're just gonna throw them out anyway, so what's the benefit of not putting all demographic questions at the beginning?

submitted by /u/princehumpydink
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source https://www.reddit.com/r/beermoney/comments/coni22/why_do_research_companies_put_demographic/