Problem is the Michelin calculator (which is based on known calculations that have been around for many years), is that it's designed to give a particular size of tire and weight being carried the correct PSI for max wear and handling. Sure you could put more PSI in the tire then recommended but you will upset the proper PSI balance for the tire/weight combo and in turn the tire won't wear as long, ride as well, nor handle as well. Plus studies have shown that running too much air pressure will actually make the bike less efficient because the combination of streets not being smooth as glass and over inflation increases rolling resistance due to vibration being generated, and traction will be reduced due to the tire bouncing and could cause a bicycle to skid out of control on a turn, plus subject the tire to more damage.

See this for more detail, but scroll down to Width and Pressure: http://www.sheldonbrown.com/tires.html