There are a lot of dark marketplaces but I do not think that there is something wrong with that because it are just some market places that are not only selling bad things too..
It can even boost the bitcoin too so..
Really? Isn't it that if you go to that dark marketplaces, your account may be put in danger since there are many bad people like hackers who wants to steal other's bitcoins ? I've never been in Dark marketplaces before and I am not gonna go there in the first place.
Now in terms of its effect on boosting bitcoins? Please tell me how is it going to affect since all of the transactions happening there is illegal. I think it will just affect the reputation of bitcoin.