I'm a little late to this thread, but let me throw a few things out there.
I actually work in the video games industry and have for 14 years now as a programmer. I've created games for most platforms from the 3D0 on up to the 360. I'm currently on a Nintendo Wii project, my last one was a DS project. I've worked on projects for Blizzard, Namco, THQ, Majesco, RedStorm, Disney and many more.
Making money off of video games is very difficult, this is due to both the sales expected as well as huge development costs. My current project has a $30,000,000 budget and its actually *NOT* enough.
To do a bare bones sledding game like mentioned here would run approx $1.5 million on the cheap... to upwards of $5-8 million for a game with lots of polish. Unfortunately how many people snowmobile? Its a fraction of what ride ATVs. ATV games do attract the city folk that have never ridden an ATV but think the games are cool. Would a boondocking game appeal to them? /shrug.
Bottom line it takes ALOT of resources to do a game on the current gen hardware and costs are rising dramatically. I hate to say it but I doubt you could make a snowmobiling game and break even on it. There is a chance someone might do a "freestyle" type game and include sleds into it along with other vehicle types... but a dedicated sledding game is a tough sell.
The most profitable platform is the Nintendo DS followed by the Nintendo Wii. 360 & PS3 arent even close due to lower unit sales. There are around 17 million PS3s, 20 million 360's and nearly 35 million Wii's sold. Nintendo DS? Those are at a staggering 85 million units sold!
If you assume your game will have 3% market sales would you rather have 3% of 17 million or 3% of 85 million?
-DallanC