Plot twitst: I dont have any webcams. Lol.
I work as a sysadmin and had a user in my building call us about one of these emails. I didn't say it out loud but, if it wasn't true, why would he even feel the need to ask if it was real or possible?
Damn. 5 Times a Day? Aren't you getting sore or anything?
Threaten them with a copyright strike...
Have they learned nothing from that plagiarism video?
Invest some time in transferring to a new email address but also an email alias service. That way you never give out your new email address to anyone and give each site/service you use its own alias.
The first rule of blackmail: supply proof. Not hints or riddles; proof. If they don't attach pictures (or a severed thumb, whatever) it's nonsense.
From the spammers' perspective, though, they sent millions of emails like this at basically zero cost; my catch-all mailbox for five domains gets about a dozen a day. If one moron pays up it's work it to them.