No this is a filter. It is the same reason why the wife of nelson mandela has millions to give. Any interaction after initial spam cost time and hence if there is no return it is lost opportunity. Best victims are the ones which are not aware that there is a scam at all. Overseeing bad spelling correlates with inability to read carefully which correlates with being with bad intelligence. So people answering very bad spam are in fact more likely very good victims.
To be honest all this skin cancer detection stuff is kind of non-proven to be effective. Problem with this is that it leads to overtreatment and a non-measurable prolonging of life-time.