I would agree that it is a short sighted to swap worn spring plates side to side. You still have to do a corner balance/alignment when you are done. And that goes about $600 +/- if it's done properly.
Why skrimp on the parts when you can get proper rubber bushings for a measly $70 from pelican here:
http://www.pelicanparts.com/cgi-bin/smart/more_info.cgi?pn=ERMP-2290003&catalog_description=Elephant%20Racing%20Rubber%20S pring%20Plate%20Bushing%20Set%20Of%20Four%2C%20%39 %31%31%2F%39%31%31%20Turbo%20%28%31%39%36%38%2D%38 %39%29
And swapping sides only solves half the problem. Yes, it flips the 'fat' side of the bushing to the bottom, but it leave an undersized bushing in place.
And undersize bushings will slip to accomodate the rotation, when they should be deforming to accomodate rotation by design. I'll grab a picture to make my point.