I don't use multiple names, but my DW deliberately used her maiden name to allow us to look like we weren't a married couple, just collaborating authors. And because, of course, she'd always used that name, and saw no particular need to change it.
I know in the case of some readers the multiple names was to keep different audio publishers separated. So BOT got Donada Peters, but Wanda McCaddon was used for a different publisher.