I want to buy from the Frictional Games Store but it seems to be a bad investment

[Cookieeater]

As like some other people in this thread, I pirated the game. After seeing how great it was 1 hour in, I wanted to buy it to support the developers considering it's only a 5 man team and they're not financially stable! Normally I would go and buy it at their official store to support the developers. So I check in their official store, and it turns out that you can't re download the game after you download it. Instead, it gives this option for 5 bucks to redownload it any time for 1 year. Obviously i'm torn between buying it on the Frictional Games store and buying it on Steam. If I get it on Steam, I get to redownload Amnesia any time I want which is great. But part of the profit goes to Steam as well so i'm torn by that. What should I choose?!