Dear Unity Church,
Thank you for reaching out! Excellent question!
As you pointed out there is the tech support via the forums for our license holders. On top of that, with a valid license you will receive the updated of our premium plugins for the period of the license.
Even though we thoroughly test all our plugins before letting them out in the wild , sometime some bugs and glitches remain. These usually get fixed in the upcoming releases, which you are entitled to if you have a valid license.
Also note, we usually give a discount for license renewals as a way of thank you to our customers. The users usually get an email with a code or a link before the license runs out.
I hope this answers your question. Let me know if I can be of any more help.
Cheers,
Andras