I can see that reasoning but I also think if I was essentially a startup toy company and my first run of figures have sold out - and the line is becoming more popular as more people know about it and secondary prices were rising - that I would want to go back and get some of the basics back out there given I didn't have any new development costs. You want to build a customer base to include those who may not have been in on the ground floor as well, so back to production for the most popular figures seems like it would support that.
I totally get where you're coming from and while I would normally be inclined to agree; that really just doesn't seem to be an accurate picture based on the people I've spoken to. The reality for a lot of these companies is that quick sell-outs are great, but not indicative that the product can support the minimum order quantity of that same item all over again. Your MOQ may be 20,000 units, so you make 20,000 units and they sell out immediately because you have 30,000 fans. But if you go into production on that same item again, you're basically going to end up sitting on 10,000 units in unsold stock.
Obviously, that's a very simplistic picture of the situation, but you get it.
And these smaller start-ups aren't grabbing big licenses, generally. They're not refusing to re-issue Darth Vader. They're refusing to reissue 'this specific version of this specific goblin figure with this specific color scheme, with this specific gear.' And realistically, almost no one jumping on board later is going to be wildly angry that they can't get THAT figure, as long as the company keeps producing similar stuff they can get.
That's why you'll see companies like this (and Boss Fight, and others) make new figures that are -quite similar- to older ones, but not the same. You satisfy the demand for the old one, mostly, but also entice people that already have it to grab this new one as well. So they're still getting use out of the tooling, without over-extending themselves by producing too much of one thing.
I mean, we've already seen several lizard guy variants that were not part of the original KS. I have to imagine that more army-builder friendly ones are also on the radar.