Unfortunately that is the technical implication of basing it on the PS3. If you base it on PC you can reduce the lighting detail and texture fidelity when you move to PS3 and use simpler shader effects. If you start at the PS3 you can't magically add more animation frames and higher detail models for the PC version. To go farther than that to make use of high end PC features essentially requires branching your engine and duplicating your base assets and developers even id software with rage don't do that because it is too hard to maintain and keep them in sync.