Oh lordy, no.  We definitely do need another section dedicated to gambling, whether bitcoin is mentioned or not.  You said you checked out the gambling section(s) so you must have realized that most of what gets posted there is 96% garbage churned out by members in gambling-related campaigns and who never stray very far into other sections.

I've seen plenty of threads where gambling topics that are only tangential to crypto are discussed for dozens of pages, so how would a new section narrowing the focus to altcoins add much to the slop that's already there?

I'm voting a hard no on this one.