I kind of know where you're coming from because years ago I didn't understand that concept either. We are freebs. We get 15 post total in a 24 hour period...period.
Everyone gets 1 hour free open resources for advfn to advertise itself to NEW people or people surfing by, it's not a gift to registered free members as such.
Our 15 posts are already free and you can not 'hold' aside posts. When happy hour is on, there's no difference to your post count, it still counts down to 15 regardless of that hour that is free, allowing you to post hundreds of posts. You posted 10 times for free, then 4PM starts on Friday and your next 5 free posts finishes your stipend and when happy hour is over so are your posting privileges.
I'm sorry but I can't explain it any clearer. Ihub doesn't stop your free post count no matter what event is on.
I think you need to find the rule in the ihub disclaimers that says happy hour does NOT count against our stipend.