I have streamed Oolite about twenty hours total on SmashTV (formerly HitboxTV) at the end of last year. Hitbox has far less viewers than Twitch, but I never got Twitch to make my stream appear in the live streams list - I suspect probably due to the low quality of my stream because I have very little upstream bandwidth. At least with Hitbox my stream was actually visible; and they updated the icon for Oolite quickly on my request.
My hope was to make someone discover Oolite, but the only viewers I had were people from the IRC channel. Which is still nice to have, because it "ups" your stream in Twitch's/Hitbox's live streams list and make it more visible. I got no "new" viewer, yet I will probably stream again when I come back to Oolite. Building viewership requires a lot of patience for any game and any platform.
As AC noted, Oolite is a tough sell. However I'd rather show it as it is than making a somewhat misleading sort of trailer (let's leave that to commercial games
. In the end, only a certain type of player will actually stick to it. Showing something else can only work against us.