I’m contacting you as I’d like to confirm what is written in your terms:
All our WordPress themes are licensed under the GNU general public license. You may use your purchased theme on as many websites as you like. Please check your license.txt in your theme folder after you download it.
Can I use the purchased theme in a second website?
Yes, you can use it but you will not get auto updates and premium support. You need to have active license key to get auto updates and premium support. So we recommend you to buy new license for each site. However, if you want to use theme without license key, you can use it as many site as you like.