Does spam email actually work?

The long-running series in which readers answer other readers’ questions on subjects ranging from trivial flights of fancy to profound scientific and philosophical conceptsDoes spam email actually work? I don’t mean dodgy phishing emails, but the annoying ads and sales pitches. Presumably the answer is yes, otherwise the spammers wouldn’t bother, but I find it hard to believe. Ali Farhan, ManchesterPost your answers (and new questions) below or send them to nq@theguardian.com.