When people invest in companies pretending to be crowdfunding such as Leancy who posed as an IT investment company and stole $5,000,000 from people, then I would have a problem.
Otherwise we all know the risks.
Here's my problem: they aren't gambling. Perhaps they are gambling in the strictest letter-of-the-law sense, but so is literally everything else in the world. The gambling section should be for gambling games with well defined rules, payouts, and (ideally) are provably fair.
Think about how it looks to someone just getting into bitcoins. They come to the largest forum, and click on one of the largest sub-forums (gambling). And oh look, it's 25% ponzis. That's a very bad look, as ponzi's are universally reviled. To the casual viewer, it looks like the only thing to do with bitcoins is funnel them into a ponzi. It makes something that is already misunderstood by a large portion of the population look even MORE shady.
No more reason for people to whine!