Hmm, I'd consider setting up an EC2 image with this pre-installed. You can spin up copies for people that want to try it out with their own data (you'd run the server, charge them a nominal fee, and they'd get a full inspection of the system). When they choose to buy, you give them a copy of their image. They can run it on amazon, or export the VM to run on any machine they like. Or, they can install the software and drop-in the database images from the VM.