[Tyhm]

Good reasons going monthly with Classic is a bad idea:
1) Hackers. If it costs less to have a month of Classic, it costs less to screw with the servers. Also, if you're down to one last day of Classic, why not get yourself banned? It's not like you're losing anything...
2) Punishment and Appeals. If you're jailed on Mithica for a month for insulting the GP Admin's mother, it's one thing if you've got a lifetime paid for anyway...and another thing entirely if you're paying by the month. A month out of a lifetime account is negligable, but if you're paying let's say $5 a month, are you entitled to get $1 back?
3) Playercount and community. It's already been demonstrated that going pay cost the Playercount dearly - with less people on (and more servers for them to Be on), the sense of community dwindled. Going even more elite will mean an even smaller chance of finding someone online on your favorite server

Pray continue...