There's no mod for this but it could be done with the built in subscriptions system.
Make a new usergroup allowed to have signatures... Your other usergroups would not be allowed to have signatures. You do this from your Usergroup Manager in Admin CP.
(Signature Permissions -> Can Use Signatures -> NO)
Then make a new subscription in your subscription manager, let people "buy" an upgrade to your usergroup that is allowed to have signatures... You can have PyaPal auto-renew so they have to cancel it if they want to stop paying.
When a subscription expires they will be returned to the usergroup not allowed to use signatures.
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