Much as I like the Laxius games, I don't think they would sell that well on Steam. They were fine when they came out, but when it comes to just the outer presentation, LF, with mostly out-of-the-box graphics and music, doesn't cut it. There's been so much run-of-the-mill RPG-Maker shlock that's come out since, some of which has been released on Steam, that you need a decent presentation in order to do well. (It makes people think your RP [i]isn't[/i ]run-of-the-mill RPG-Maker schlock, for one thing. And it isn't, but the important thing is to make the vast majority outside of the average RPG-Maker community believe that.) I think Millennium has that, but LF, being the first commercial game that Indie put out, does not. (Don't get me wrong;' when it comes to gameplay and story, I think that the LF games trump everything Indie's put out since. But presentation is more important to successful sales than some realize, and Millenium has one of the best presentations of anything Indie's produced.)
That said, if the Millennium games sell well, maybe you could still get a decent amount of sales for the LP games on Steam as well. But they still probably won't sell as well as Millennium.