It would be interesting to draw from a nice range of 'balanced' PC's to get an idea of how the graph would be expected to go. For example across 3 balanced platforms starting with a P1 lowest spec through to a P4 High spec, some kind of benchmark tool.

The data could possibly then provide a rolling expectation of performance chart that could allow you to plot your title and cross reference the recommended PC spec for your title.

Very interesting and certainly more research is needed in this area.