That's a very good point and obviously something I have thought about. I ignore spammers for instance. They won't be eligible for any type of prizes from any of my contests.
I don't think spammers have the energy to spam when they realize that no one rewards low-quality or no-effort-nonsense either, so it doesn't take long before they stop.
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I hope you're right and the curation system filters out the spammers or makes it so that the effort increases. I also assume the worse spammers won't stick around very long since they'll get bored or don't see much increase in their earnings. As with many things here, time will tell :-)
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