But again we're back to the if they're not looking at those parts then how helpful are they really being thing. If you try to force people to see/use things they don't care about, then most will move on to something else. Path of least resistance blah blah blah.... I just don't believe there would be a measurable increase in contributions from this audience if official MAME were the only option.
You'd have to be real dedicated and have a special interest in something to spend time on some of the stuff in MAME these days. That small percentage of people are not interested at all in a project like ARCADE.