Re: Shouldn't there be a rule to prevent burst-posting or spam such as this?
Honestly, I was too modest with that percentage, I think it's more like 50%, but that's still a matter of personal assessment. Anyway, I think that there is a lot of spam, but that there are too few people who still care about it.
Gambling discussion board does get a lot of generic and repeated posts, so I think you are not wrong for saying that section has a 50% ratio of spam posts. However, that board is one of the most crowded boards in the forum. The reason why people care less about it is probably because the board is good for advertisement and promotional purposes. We know most of the companies and services that choose this forum for advertisement either through signature campaigns or other means are casino platforms, and they wouldn't like it if the traffic from that board is cut. Regardless, the board needs to be moderated more strictly to make it cleaner.
It seems that your topic and activity of reports against this user are starting to affect him a little 
. According to statistics, today he created seven posts. But five have already been deleted by moderators.
. According to statistics, today he created seven posts. But five have already been deleted by moderators.That's a good sign. I'm sure my topic made some other users report his posts as well and we are seeing positive results, at least for now.
The conclusion is that someone will win; the only question is, who will have enough patience?
Well, I'm pretty sure he won't stop until he gets a temp or permanent ban, but we can do our best to push him back as much as possible.