3-CMC might be dangerous as its relative amphetamines, 3-C(M)A are neurotoxins used in lab rats to selectively kill serotonergic neurons. This link made many people to stay away from these substances but I was surprised to see them still being sold and people take it seemingly without acute adverse effects, I've occasionally read some not so good stuff though but that's the case with most chems. These chlormethcathinones are still drugs I don't know what to think about.
Last time I was in Amsterdam I asked the smart shops for research chemicals and one sold me a coal which I should afterwards read that it contained two other cathinones and 4-cmc. Usually I'd do more research before ingesting something new but they told me just the first two ingredients and I was in latent opioid withdrawal and quite desperate for some euphoria. The effects were nice, but felt somewhat off, don't know whether it was from my general mental state or the compound. Rapid tolerance and/or desensitisation, a second dose on the day after brought just a fraction of the euphoria, which is very unlike 4-mmc. So I'd say it's not an upgraded 3-mmc but a different chem with its own profile. Possibly not toxic but depleting serotonin at least.
My recommendation would be 3-methylamphetamine but have to admit that I'm lacking behind in terms of reading up about novel chemicals so it's not fore sure.
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Forgot to mention this earlier, your statement about setting some companies up for to generating big amounts of money caught my curiosity. Would you mind to elaborate this a bit more? Shoot me a PN if you don't like to talk about in public.