I have about 30 odd bits of old murano glass now, only three are in good nick the others have repairs mainly at the weakest point on the stem which gives first if the glass has a knock, or they just shatter and are beyond repair none are chipped. I was looking through a box of charity shop donations earlier given to a local St Marys hospice i help and an independant church charity shop and you would not believe what gets thrown away, including lots of pressed glass and as a rule any charity shop can not sell anything chipped. If every one threw away six things a week thats 3,276,000 going into landfill or being recycled every year.
Most of my old murano glass does not look damaged the repairs are very clever, the local antiques dealers are always getting glass repaired at the red house glass cone not far from where i live, i reckon some repairs ruin the shape and original design.