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You only list that which your target audience will be interested in. Anything else is noise if not a detractor. The people signing up for the NASCAR updates don't care and don't want to hear about us crazy two wheel nutjobs that like to turn left AND right. They put good money into that message, they don't want to dilute it.
That's my read anyways. I think you'd have better luck pushing for a motorcycle specific list for announcements, but now you're back to the chicken vs egg problem of getting people outside of our core group to know about it.