But, just as a personal example, i've been running openbazaar routed trough tor to sell consulting (which is not illegal). I stopped doing it because of the lack of clients.
Another example is that i've been running my testnet faucet with a clearnet and darknet interface...
Also, a lot of clearnet companys have a darknet presence...
So, all in all, the darknet tends to have a little more illegal stuff, but it's defenately not 100% scam and scum over there... Some people use tor for privacy, some use it to escape the unreasonable requests of their governements, some use it as a technical enhancement (against, for example, DDos attacks on clearnet mirrors)... And some use it for illegal or immoral stuff...
Thanks @mocacinno. I've always found your views insightful. So I'll just search "darknet" and that's it...