Or even, gasp, profitability for the developers. That's a perfectly reasonable thing for a developer or company to expect.

It would be better, though, if they published pricing and had a self-service purchase process, rather than requiring users to contact them.

It's a really new project, so they're probably still figuring out what model works best and might want to limit the kind of deal they do - e.g. make sure it fits the client and they can support them with development where necessary. Freely selling licenses and then have unhappy customers that didn't evaluate the current state properly would be problematic.

Perhaps, but it's a bit of a dilemma - a GPL license likely won't allow this to gain enough traction to become sustainable in the first place.