Re: Shouldn't there be a rule to prevent burst-posting or spam such as this?
Just keep reporting the posts and explain in details while reporting it. All his spam posts would be deleted and he may likely get temporary ban.
I used to do that, until I gave up. ~snip~
I had several successful reports regarding this user, but my last 3 reports from ten days ago are still unhandled. Obviously, there are different criteria among mods, because the only message that these spammers understand is as many deleted posts as possible, followed by a temporary ban.
If that doesn't make them understand, there is only one more option, but a permanent ban due to spam is something that is hard to expect.
