You know what else is interesting? Their "no sales" sales philosophy. For me its the reason never to buy it. I actually revolt when I hear their reasons. I feel like it comes down to: we are willing to hurt our options for making more profit to prevent people with lesser budgets from buying it. But its very interesting since a lot of people have the opposite reaction. They feel it is more valuable if it doesn't go on…
There's actually quite a lot you can do in it, and it's what hooked me on the game. You might feel different about paying full price for it after you play the demo.
For me, Factorio is easily worth twice or even three times the price they're charging. I've pissed away so much money on half-baked, low effort, insanely buggy games, and even "cheap" games are usually not worth the money. With some games, I feel the developers should have been paying me for what amounted to beta-testing their buggy, poorly conceived and executed product and wasting my time.
Factorio is different. It's true work of love. The developers could have abandoned the game years ago and it still would have been one of the most feature rich, well thought-out, and stable game ever made. But they've kept working on it and adding new things to it without charging anything extra, in contrast to what many other game studios have done when they've released content or new versions of their game and charged for it.
Factorio just keeps getting better and better, and all I've paid was the initial $30 for the game.
Factorio's modding community is also absolutely fantastic, and they've enriched the game many fold as their mods exponentially increase the possibilities in the game and give you tons of new content.. for free.