If you were to search auction sites with name by name from a list it would take forever and you would never find anything, especially on Yahoo Japan where you would have to search in machine translated Japanese. After years of doing it I automatically know 95% of boards if they are needed or not just scrolling through a list of auctions without even opening up individual ones. That goes especially for eBay, Japanese stuff is a bit harder. A list of needed boards really doesn't do me much good most of the time. It's more whether something is not in my mameui list. The undumped lists come in handy when I have to use a machine translator on Yahoo Japan for something that isn't in mame and the machine translation matches something on an undumped list, helps to verify in that regard.
That, plus magic.
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