I figure Festool must be making serious money on Systainers, otherwise they'd offer many of their tools in cardboard boxes to reduce the price and make their tools more appealing to DIYers.
But, I suspect that's not really their target market.
I don't think they have any interest in DIYers or trying to work their way down. At best, it might create a volume demand that they are just not prepared to meet. Then comes the choice of figuring out how to increase manufacturing, cutting cost, outsourcing, etc. That might lead to quality control issues or at least a big investment, either of which is a gamble.
At worst, they try to get the price down, but it's still not enough to break into that segment of the market. So, they have put more thought/effort into it for no gain
and reduced the value of what they already had.
Calculated non-risk
That said, I like Systainers, I just wish they hadn't messed with the sizes. They broke the "system" aspect with that move. The whole Bott thing might be more popular in Europe, but I don't see the appeal.
I would like to see other brands step into that arena too, at least offering an option, even if it was a stand alone accessory item. You can get "branded" Systainers from Woodpeckers, Shaper, Mirka, TSO products, Lamello, and to some degree Makita. Fein used to sell one model in a Systainer too, though I don't know if the still do?
The system offers protection for mobile users, as well as organization. In the shop, it also means that things can have a "home", which encourages you to put things away. Also, the ability to keep accessories contained/concentrated, shouldn't be overlooked.
If your CXS is in some bag, rack, drawer somewhere....where is the drill chuck, Centrotech adaptor, 90 degree attachment? Even if you do know exactly where, it's not right there in the same place.
With routers, you can have another Systainer, right there connected to it, with more bits. Sander? extra abrasives, edge protector, interface pad, etc. Domino? the same, cutters, tenons, etc. Jig saw, TS, the list goes on.
It's not that pros don't care about price at all, but the initial outlay is far less important. Reliability, warranty, and repairability, all factor into the real cost of ownership. (which includes the potential cost of missing deadlines)
Depending on your tools, versus hobby use, is completely different.