yeah I see what you mean and totally agree but yet, why not make a distinction between non commercial users/hobbyists and professionals that make revenue with it?
For example, software developers set a lower price for freelancers or individuals and then provide a much more expensive (for same software) "license" for businesses. This model allows them to get a small part from the professionals revenue upfront to cover for own expenses and also use it to justify delivering non commercial licenses for consumers at lower price points.
In my case I focus on professionals that would make revenue and seek a commercial license, but in your case I see you provide custom license but still allow for commercial use?
Consider a professional getting your unbelievable work here for just 21 dollars.
He would for example use it as a base for some educational VR experience for viewing microscopic things via some fantastic sci-fi shrinking device or something (he just uses a shrunken down version of the disc outside and puts it up on the sealing in the base to serve as the fantastic devise). He then grabs some additional 3D microscopic items here on CGt and do a bit of work connecting up some interface elements to drive the narrative and setting up the actions for loading the microscopic models and immerse the viewer in the consecutive microscopic scenery's,... done.
He would now have a valuable product and plenty of opportunities to sell it in multiple way's and probably make 100 times more then you for far less work?
There are lots of ways people can make good money from this and they will definitely do so.
The question is, should those people pay same as the hobbyist?
I'm just sharing ideas,
You could for example upload the product two times, provide one with a non commercial license and the other (with higher price point) with a commercial license? Maybe put in description of the non commercial version a text like "if you need commercial license please refer to this", and then put up link to the commercial version?
Personally I believe it won't take too long now before expansive social VR worlds are coming online, things like Linden Lab Sansar and High Fidelity VR, also consider things like Janus VR. Those will have build in content markets supporting and targeting large consumer bases and it would make sense to position things at lower price point on those (with non commercial licenses) and refer professionals to here for obtaining professional license in case it involves other projects meant for getting revenue.
Again this is all just idea's ok, I'm not trying to force anyone to do anything.