If you go to the Pricing page: http://www.trackitforward.com/payment/free, you will find the different payment plans available:
You do not need to have more than 25 volunteers to upgrade to the convenience of a paid plan.
Currently a main difference between the free plan and paid plans is the ability to approve submissions and assign a multitude of managers and permissions is only on the paid plan.
Once you reach the next level of volunteers you will be prompted to upgrade to help us stay competitive and provide more feature development and customer service.
If you manage lots of volunteers at multiple sites, you should choose the Group Network plan. This plan gives you unlimited hour submissions, phone support, online training and the capacity for many projects. You would have access to organize multiple sites, have multiple admins per site and each site can operate independently under one paid plan. Go ahead and contact us directly to set this special plan up.