I think Rodster has it - its the sand - we had the same problem in central florida the blades and actually the deck was continually sand blasted until there were holes sandblasted through the deck and the blades wore out. I remember the blades almost splitting in half from the tip in towards the center by the end of the year - although I never had to scrape grass off the bottom of the deck ever!
My ohio SGT mower blades (though no where as pretty as rodsters) are over 20years old. its retired from mowing several years now but the ZTR's last about five seasons they need replaced due to the amount of sharpening's - mowing gravel dulls a blade quickly!
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