It's possible that "business" model radios, like cheaper airsoft guns, are made of less-hardy materials. I interned for a summer in high school working at the radio shop at Palo Verde, and they ran the whole site on Moto HT1000's, which are a business-model radio. The bodies were pot-metal, which was sufficient in the vast majority of cases, but we got a new box of a dozen or more busted radios every week from Security. They had a recurring problem where, if the radio was dropped (as a dozen or more guards would apparently do every week), the circuit board would shear off the single pot-metal nub holding it in place, and that nub would do the pachinko thing down the back of the board, shorting everything out and blowing the soldered-on microfuse. For us, this was a five-minute fix to unsolder and replace the microfuse, but most people don't have a pair of soldering tweezers on hand to easily accomplish a task like that.
However, they do run the WHOLE site on HT1000's, so I really only have one model's worth of experience, and thus this is largely conjecture. Your mileage may vary.
