factorioとrimworldに関しては割引・値引に関するポリシーが少なからず公開されてる(特にfactorio※)から
定価買いが不満ってならリスク背負った鍵屋でどうぞとしか

>We state it on our steam page, but people are still asking about it so I want to state it officially. We don't plan any Factorio sale.
>I'm aware, that the sale can make a lot of money in a short period of time, but I believe that it is not worth it in the long run,
>and since we are not in financial pressure we can afford to think in the long run.
>We don't like sales for the same reason we don't like the 9.99 prices. We want to be honest with our customers.
>When it costs 20, we don't want to make it feel like 10 and something. The same is with the sale, as you are basically saying,
>that someone who doesn't want to waste his time by searching for sales or special offers has to pay more.
https://www.factorio.com/blog/post/fff-140
>意訳： 公式にアナウンスしておくと、Factorioはセールしないよ。
>セールは長期的に考えると悪影響だし、Factorioの売れ行きは好調だから短期間にまとめて稼ぐ必要はないよ。
>本来の価格が3000円なのに2980円という値段を付けることで2000円(＋α)と思わせる手法が嫌いだし、
>同じ理由で本当は3000円なのに2000円(＋33%オフを待つ時間)と誤解させることはしないよ。顧客には素直でありたい。