Depends on a lot of things. Tapastics NSFW policy is pretty cut-and-dry, so even if in my comic's length there's only been a few pages of real violence or tits-being-flashed (a character is a stripper), I have to abide by it. That and the fact that the people are a little foul and vulgar, in that way millennials can be, it does qualify as something not safe for work.
I think it does impact our traffic, we could be doing better if we tidied things up but it'd also sort of break the tone of dysfunction. I don't read a lot of NSFW comics on this site, and in general I do find a lot of them lacking in a real appreciation for what they're doing---but that comes from having spent a time as a smut-writer for hire. There's too much convenience to a lot of NSFW comics that focus on sexuality. Rarely does it explore the grotesque minds of the sort of people who inhabit those fields or make sex the core of their beings, and rarely does it get creative with the environment, which bothers me personally because if you don't use it you may as well not have it.
But I'm finicky and I come into this with my own hang-ups and such. I'll read a BL story if it is cute and maybe goes into something, but as a gay guy I often get fed up at the contrived stories. The men often lack variety and diversity, and rarely due their personalities line up with their physicality; and while sure one need not look like a reflection of their personality---that's often the case. People do things for a reason, especially when it comes to self-improvement and fashion/costume choice. Pretty boy killers lack integrity if they don't look like they've spent long nights sleeping in a car or a bolt hole hotel worried about the cops or thinking about turning the gun on themselves or what their mother would think of them. A rare niche example sure, but also something I read lately. Lacked grit.
But BL is often written to appeal to a female audience, much like lesbian smut is often written to appeal to a male audience. Broad generalizations, but notable.
I guess I'd probably consume more NSFW material if more of it had interesting choices made on behalf of the creator that reflect the human condition rather than playing into old hat tropes and cliches.
It's an interesting thing. Looking at my comic, and other comics that use profanities around this site, I could probably get away with unflagging all but a page or two; but I'd rather not risk it. At the same time, I had The Sisters as a Staff Pick back in August and we've nabbed a number of subscribers; so clearly being NSFW hasn't hampered us too heavily.