I have done the exact thing as Basilkos described. I started mine however a long time ago with intention of making real guild but I found being a leader and having to put up with so many people's issue just tedious and taxing. I put my characters on that server on idle and let the people just quit over time and kicked the remaining two people out. But yes, I started my guild by offering 5 gold per signature and I collected 9 signatures. It was expensive, because the noob members would ask for more gold.

To me its worth doing because the giuld bank alone is great for stroring items and mats to service all your characters needs and more so when you have more than one account. From time to time you have to put up with a person asking to join the guild and I simply just tell them that the guild is private where all members belong to me. Of course that sometimes opens up a new can of worms, espically with little kids who do not grasp concepts as quickly as you would like them to.