I think there were jet packs in the 1970s, too. But I never knew anyone who owned one.
But that's still 30 years ago so Lego has been fancy pieces and custom kits for a couple generations of kids now.
You can get a 790 piece big box of Lego brand plastic building blocks on Amazon for $35. These types of collections tend to end up in yard sells, or passed around extended families because they last longer than a single childhood. The none-fancy Lego branded blocks still exist, and are still a common part of childhood in America. Lego just doesn't have to market them as hard, and the sale volume is naturally lower.
Then when you get bored with the specialty model as-it-is, the pieces go in the bins and you remix them with everything else :)
This [1] from LEGO Movie specifically plays on the 1980's space sets, for example, and I personally had quite a few of these [2] sets in the early 80's.
[1] https://www.lego.com/en-gb/product/benny-s-space-squad-70841
[2] http://www.doubledumbassonyou.com/2016/02/19/lets-enjoy-a-lo...
> If there’s one big gripe common among brickheads, it’s that the prices of LEGO sets are quite lofty (plus maybe not enough spaceships). But two disparate people interested in the plastique fantastique eschewed conjecture in favor of hard data, and found that LEGO prices scale linearly with piece count, and that on average, prices of sets have actually remained constant over the last couple of decades.
https://nerdist.com/article/notoriously-expensive-lego-price...
But LEGO has always favoured pieces that even when they look very specific usually have a significant level of reusability in other contexts. Hence "pointless" pieces that aren't actually pointless because their appearance is sufficiently generic.
E.g. you can still buy loose bricks from LEGO, so can make it as simple as you like. If you want basic stuff packaged up, the LEGO Classic line has sets starting very small that consists of a batch of bricks and a small set of themed special parts. On the UK site at least they also have more than 500 sets under 20 GBP/25 USD (you can search by price) including a number under 10 GBP / $12, but the majority of these sets will be full of special parts simply because there's little point in packaging up the same small selection of basic bricks in umpteen different sets.
Overall, the price per piece of LEGO varies greatly by set (average per category of set varies from less than 20 cents to nearly 2 dollars per piece) because of different weighting of types of pieces, but the inflation adjusted cost of the basic/cheapest pieces have remained consistently stable [1]
Based on prices I've seen shopping for my nephews they seem to be a luxury brand now that can afford to. Lots of elaborate and expensive sets sold for $50-200. In my day they were closer to plain bricks.