I think it is definitely worth it. If you do add 2 subscriptions I would Recruit-A-Friend (RAF) your 2 new accounts as, while you don't get the in game items, on Classic you do get the free subscription benefits (if I recall correctly basically every 3 RAF subscriptions is a free subscription so your 2 new ones should only cost you 1.33 subscriptions).

New 5 boxers should be able to RAF all of their accounts and get 1.67 subscriptions free and thus only have to pay a net 3.33 going forward if the program keeps paying in perpetuity.