The reason people don't offer this as a service (alone) is because IMers are shady as fuck. Normally most of them will just change their password and never pay you. Also its not worth the time if you are not from a tier3 country.
If you are using proxies already, you might be interested in my service.
EDIT : Make sure you don't get your accounts stolen. Once people have access to your E-Mail they can just request a password reset.
Try to follow the steps which are in the unban guide on this forum. It will work sooner or later