Pathfinder,
Happy to hear you like what we made so far! Thanks!
You are right, the modeling hobby does not generate enough volume of sale to get the costs for injection molds back, including pre- and post preparation. But what works the inverted way (i.e. "negative" molds) of course also works the other way, meaning a Milling machine can also generate a "positive" master. The CAD/Milling Machine and sometimes Stereolithographie combination does have a lot of advantages but will mostly need normal modeling techniques as well. Casted with silicon molds, a broad range of special resins (from rubber-like to clear UV resistant, from soft to very hard) and low de-molding time (between 20 and 120 minutes), and a special casting machine makes it, at least for us, affordable.
And there is one advantage silicon molds have that you just can't beat (compared to metal molds): There are no limitations in detail. We made tests with the manufacturer of the molding machine and you could even see fingerprints left on the master. If metal molds get too detailed and maybe large also, the costs just rocket sky-high.
But the best machines won't help if you don't have something you can produce as a model or don't have enough information.
And of course, it can never replace experience. So there is a lot of testing, testing, testing and failure...