Unfortunately, Bliz's terms have covered that...
1) Add-ons must be free of charge.
All add-ons must be distributed free of charge.Developers may not create “premium”; versions of add-ons with additional for-pay features, charge money to download an add-on, charge for services related to the add-on, or otherwise require some form of monetary compensation to download or access an add-on.
While technically, if I charge for the web site membership, then I am not charging for the download, it would be a very hard position to defend since there would be no other reason to pay for a membership.
I could offer support on the site for a paid membership, but the next clause "charge for services related to the add-on" would preclude that too since support is a service and since it is support of the add-on, then it's related to the add-on.
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