Yes. The key determining factor as to whether or not you need to purchase a license has to do with whether or not you are a COMMERCIAL ENTITY... and has absolutely nothing to do with whether or not you choose to charge anything for the use of any servers you host. So, as a GSP or web hosting company of any kind, you must license any and ALL TeamSpeak servers you host regardless of whether or not you choose to charge anything for the use of those servers. Sponsorships to clans/guilds do NOT exclude you from having to pay for licensing. Once again, if you are a COMMERCIAL ENTITY in business to make a profit of ANY kind, you MUST purchase and license ALL of your TeamSpeak servers.