I think we're dealing with a combination of things here. First of all, I have nothing against products that are aimed at not super wealthy customers and beginners, no matter what their take on music is.
What became a new old ingredient ever since the 'all things analog' revival, is clearly the element of nostalgia. We see a lot of affordable instruments that are paired with that. To some degree it's even part of products like the Volcas (and their lo-fi charme as some might say), but more so, of course, in the case of the reissues. It reminds me a bit of model car collections with the difference that you can actually "drive" these synth models. Still, they somehow appear souvenir sized and just like souvenirs they are collected as surrogates for a missed opportunity (aka "When I was a kid, I always saw this magic ARP in a local music store; now I can finally afford it thanks to Korg."). In a way a lot of the current gear market has to do with collecting. There's not only the annualy returning aim of trying to get the latest or newest piece, there is also a tendency of hoarding stuff, especially due to the highly portable size, which of course leads to a paradox. While the Eurorack market does probably represent something like the sophisticated end of that, it also applies to the numerous pieces that are aimed at people with a less geeky appeal. One indicator is the occurance of the many series that emerged over the past couple of years: Volca, Aira, Boutique, Reface, etc.