There's already a good limit in place for 'new accounts' (limiting the number of posts), so I don't think that's a necessary step here.
The spammers aren't exactly clever about this, neither are they trying to hide the crap they're about.
Overall, Dakka Dakka gets rid of them fairly quickly - thanks largely due to users reporting them as soon as they show up.
They do tend to show up in waves, and we look to be in the middle of one now...
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