The problem with the sorts that would find it fascinating is that it's the discovery and knowledge of it that would lure them, and to hell with the consequences. Also they'd never test it on themselves, so they care even less.

[She joins the other woman at the table, eyeing her cup of tea for a moment before grabbing some sugar. She does give Vastra a crooked smirk however, humor glinting in her gaze for a moment.] I suspect everyone has an ulterior motive. But yes, I know what you mean.