What do you mean she's not offering anything concrete? She's offering something much more concrete than for example Double Fine did. She has a game, a game concept, a lot of info and possibilities for other projects as well.
LSL offers "more concrete" because you already know what the end result is - a remake of that game. In Double Fine Adventure, on the other hand, all we had was "a new adventure" without any information. Much less concrete.
We already know that there will be at least Moebius as the first game and there's been a lot of information about it (you can't, after all, just spill the beans about everything in the story etc.). There's also a possibility of a second game.
And a lot more on the way (and of course very concrete "tier prizes"
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