Quote: "Does anyone know if I can use Corel Bryce to make games?"
Possibly if you were a little more specific about what you wanted to do I could.
It features some nice tools for fractal heightmap generation and manipulation, so you could certainly use it to create your heightmaps. It makes creating some sexy skyboxes very simple, so you could certainly do that.
I think Guyon's right about the exporting, but it's pretty much worthless as a modeller as you have no control over polygons and vertices, which is essential for low poly modelling. You'd be better off exporting your terrains as heightmaps.
I don't think heightmaps and skyboxes are enough to justify the price tag personally. If you already have it, then fair play, but it seems like too much money for a just heightmaps and skyboxes.