Wear and tear are normal, but there are steps you can take to curb the wear (as Hal aptly put.) It depends, really, if you mostly sit or stand. Standing -- or performing in a band -- is worse for the bellows, imho. Belt buckles as I've noticed are enemies of the bellows. I've learned to put mine on from the side of my hip. Or wear a pair of tight jeans... and sometimes I even play nekkid. In that case, the bellows become MY enemy. Most wear and tear can be "fixed" using a roll of matching bellow tape. I think Elderly Instruments sells such accessories.