Charging for something when you know you are going to give away = Not a good idea. If there is existing market that you can reach, you can go with paid option.

Charging for something when you know you are going to give away = Not a good idea. If there is existing market that you can reach, you can go with paid option. Else start with open source and then add either paid version (more features) or supported version (dual license). Service in cloud is another option.