Thank you for your interest in our service. Please note DriveHQ FTP is a complete FTP solution, so it comes with FTP client, server, hosting and web access, etc. For our pricing and group user licenses, please read this page.
As you can see, we are having a special promotion. Our price is probably 5 times lower, and we have many times more features than other FTP service providers.
You do need more than 1 user licenses if you have 5-10 users. The license fee is very low anyway. Once you have a group account, you can create sub-users. Please make sure you allocate storage and download bytes to each sub-users carefully.
DriveHQ membership is required when sharing folders to other users with "write" permission. It is also necessary for each sub-user to logon with its own account.