My aggregator limits the number of items by feed and by domain. The problem is less of an issue if you add many more feeds and filter harder. Those rarely publishing do still get drowned out but it gives you plenty of other things to read. Thanks to volume, at times, if the slow publisher posts something awesome (they often do) it is reposted by the more spammy domains.

I do have other ideas to fix that issue but the ink is still wet on those.