I don't have an issue with the "ethics" of buying multiples, particularly if this person (whom I do not know) has gone to the trouble to set up a vendor account with the manufacturers or wholesalers. It's no different than any vendor buying case quantities at wholesale to sell at retail... or at higher than retail, if eBay sellers are an accurate representation of the market. The only difference is, this guy isn't selling them, at least not right away. Which means he's operating at a short-term loss, and likely a long-term loss if you factor in inflation, storage costs, future shipping costs, and possible changes in the assessment and collection of taxes on online sellers.
He sounds more like a "hoarder" than anything else. Being, unfortunately, a bit of a hoarder myself, I can easily imagine what trouble I could get in to if I had the resources to invest in case quantities of every figure I found intriguing.
Also, every time we... myself included... purchase even one piece of a "parted out" figure, we are supporting the driving up of figure prices, as resellers and regular retail buyers learn that figures are worth more parted out, and certain parts command premiums (you could pay for half your Spetznaz purchase by selling just the head). Anyone who keeps up with the comments on the New Release topics on forums can get a pretty good idea of which parts will be in demand on the secondary market, and which figures might be worth purchasing to part out for a profit.
What I don't understand is the reticence of the manufacturers to produce greater quantities of popular figures. They must be aware of "pre-sale buzz" online. It seems like they would revise production targets accordingly. Unfortunately, the figure (and doll) market seems to be making an extreme shift to the "everything is a Limited Edition" marketing model, which is serving to drive up the prices of new releases. Apparently charging higher prices for fewer figures in a smaller marketplace is proving more profitable than catering to a larger market base with more reasonable prices. Or so it seems to me at the present time.
Fortunately for me, I suppose, I was never in the market for this particular figure; however, I have certainly found this discussion fascinating to follow, from pre-release until now, while watching the secondary market prices fluctuate. There are surely some economic lessons, and possibly some sociological and psychological lessons, to be learned here.