GScripts provides three different types of scripts available on the DreamBot store: Free, Premium and Instanced.
Free
These scripts are completely free and have no cost associated. Scripts that fall under this type include GMuling or GBankDumper as examples.
Premium
Premium scripts can be run an unlimited amount of times for the account it was purchased for, for an unlimited amount of DreamBot clients (assuming you have also purchased DreamBot VIP or Sponsor). This means with DreamBot VIP or Sponsor, you could purchase Guester and if you have 50 or 100 accounts, you can have them all run it at once together with no restrictions. These scripts can be purchased on a month by month bases, or for the lifetime of GScripts.
Instanced
Instance scripts can only be run on X number of clients that you also own Y number of instances for. For example, you could buy two instances of GYama and could run two accounts either together doing duo's, or separately doing solo's. You could not open a third, but you could break those two accounts after 8 hours, then run two other accounts for 8 hours etc.