So let me get this straight - I show up at a house with a couple of mail-in ballots, offer $50 to the residents to let me fill them out, and then have them sign (not that the signature even matters). Not a bad racket.
...and I’m old enough to remember when voting was something we did in PRIVATE.
You can bribe people to vote in person too.
It’s a tried and tested method with no mail required.