I generally don't really care about the copying of code/posts as long as the content is interesting (and prefererably attributed)... but... as perlmonks is more or less a finite resource of feedback & help for the general public and the posters mentioned also have a tendency to do "drive by posting" - i.e. post stuff they quite obviously don't understand and/or aren't interested in - I would have to agree.
As far as the specific sanctions, I would say just disable the accounts. It's probably as effective and a lot less work, since anyone can start a fresh account to get around any other sanction.
Also, a tip to anyone engaging in this kind of useless posting (if you want to get away with it): using "perl" as part of your name makes you look clueless. Perl is what this board is about. Adding the word to your name doesn't add any information.