If Ubisoft announced that they were releasing BG&E on Valve's Steam, I would hope that the sales would be enough to show there is interest in the game and that a sequel would be forthcoming.
I think this may be just the low overhead nudge the game needs.

Wow, I didn't realize that Ubi is bringing their games to Steam. I thought they were tied too closely with Direct2Drive. BG&E is not on Steam yet, but it just might be in the future. That might give it a small sales boost, but I doubt it would be anything significant.

I think they should sell it for $5. Now they should not be concerned about squeezing out every penny possible, but rather having as many people play the game as possible.