Perhaps some confusion on using the advertiser banner upload mod. (Included banner-edit and campaign-edit files in admin directory).
RevMax has no control over number of banner uploads except allowing these permissions within admin > advertiser> user> permissions. If you do not use these modded files the user will not upload banners and must be dealt with individually.
There is currently no method of limiting advertisers banner uploads In RevMax. It is up to you to understand the functions of OpenX and decide if you want to use the modded files for the advertiser.
I would NOT recommend it when selling subscription campaigns. It however may be advisable when selling ad views as all views will count against an advertisers account.
If using with Subscriptions, I would use a low weight for auto campaigns, and make sure advertiser only shows one banner from campaign on page is checked. This is assuming the auto zone you used is only shown on one page. You could further limit the campaign to so may views per day.
You may also disable or delete the second banner, and revoke the banner upload permissions. The advertiser then would be limited to viewing stats.
Although the advertiser banner upload mod has changed a bit since, you can see permissions settings here:
http://btdsoft.com/banner-upload-for-openx/
You may also want to see distribution options to set daily limits:
http://www.openx.org/en/docs/2.6/userguide/Adding+a+campaign

