Perhaps because the number of folks willing to dedicate the time and mind to contribute to this very niche market are quite few, for obvious economic reasons, and those that are willing to do so deserve a bit of respect - and gratitude, frankly. Whether you intended them to be or not, your comments were pretty insulting and based upon a set of assumptions which simply aren't correct.
First off, the 1979 modules are not clones. Clones are DIY PCB and panel kits that are built to order, not ground up developments brought to market - with all the associated costs which it seems you might not be considering.
It isn't just the R&D time taken to develop the PCB (regardless of whether it's from scratch or re-purposing an existing design) and the panel, but also factoring in the estimated demand before sourcing all the necessary components to assemble multiple modules, testing and QC, advertising/website presence, working with dealers, shipping, etc.
None of those additional factors are relevant to clone designers, and those actually building them are almost universally building to order. Except Terry.
Regardless of whether they're using open source/re-purposed designs or not, if you want to judge the price of 1979's modules then do so against other folks actually bringing completed modules to market - Northern Light Modular, Studio H, Keen, or Verbos.
Even considering someone who almost exclusively designs around re-purposed PCB's - the Vedic Scapes guy - look how much his modules sell for new, and he is pretty much building to order anyway.
Al that said, your original observation that in general Buchla modules are more expensive than their Eurorack peers is valid, and a portion of that is in certain cases almost certainly due the infamous Buchla "mystique". But the vast majority of the difference is simply economy of scale - a builder's price per unit for 10 modules is not the same as for 100.
What I think is ironic in this situation is that of all the players in this niche market, !979's are in fact by far the most reasonably priced. His workmanship is impeccable, his panel designs are simple awesome (in my opinion) and yet his modules are really the cheapest of the commercial Buchla format offerings.
I know this is all water under the bridge now, but I just felt the original comments were really uncalled for.