Been there done that. I would take a different route. I will start with one application and make it easy for a developer to install and run it on their computer, ideally with some dummy data. Price it as free to use, you will get tones of users.
These users will need a way to get these local applications to a staging and to a production servers. Thats where you charge money and you control the entire cycle.
Pulling and pushing data between live and staging sites is where the demand is and there are not many easy to use solutions.
After visiting Release's site, I clicked pricing and saw $500/month for what I'd consider playground environment and my instant thought was "nope, another tool I won't use, no chance I'm paying $500 only to speak to sales later in order to agree about more money".
However, if I were charged when trying to make production work - that's something I'd pay for, if it's an application that helps with that process.
Thanks for the comment, I totally understand what you're saying. We need to do a better job of explaining that we can run production environments as well as staging. In fact, Release runs on Release.
