Hextom: Email Collection Bar

Great and effective for its purpose! I regret not subscribing to the paid version earlier since there should be more than 50 subscribers that I could get monthly. I wonder what happened to emails that were subscribed but above the 50 threshold (for free version)?
I just upgraded to the cheapest version and there is now 435/500 subscribers. Should I upgrade even further? The next level is for max 2500 subscribers