The licensing of Ghost Solution Suite has always been on the basis of one license per machine imaged.
There is no "per image created" license, as the licensing is strictly per machine at the point of deployment.
If you are using Ghost to deploy images to retail machines in a production capacity, no doubt a specific license can be negotiated with Symantec sales for this purpose - that is outside the scope of this forum to advise on further so you would need to speak to sales.
Ghost.exe has a range of command line options you can use, which should be covered in the documentation. If I recall correctly, the switch you need is -split=0 but I'm sure someone else will correct me if my memory is faulty.
Due to the lack of support in PCDOS for modern hardware such as SATA, I would strongly recommend adopting WinPE as the standard boot engine for all your imaging requirements, as it is easy, using Ghost Boot Wizard, to add and select the appropriate Vista 32 bit drivers (as required by WinPE V2) for your NIC and SATA chipsets.
25 minutes for 13 Gb is not too shabby - you don't provide any information on the LAN speed you are using, or whether you are using any compression in the images, but basically, the faster your processor runs, the faster the Ghost code will run. Both hard disk systems and network systems can create bottlenecks, as can a DOS boot environment without SmartDrv to do some caching for you.
Try imaging a system with a solid state drive and see if it goes any faster. If it does not, then there is a good chance that your network is the bottleneck.