1998 Isuzu Trooper cv joints

The rubber boots on the CV axles are torn on my 98 Trooper. The dealer quoted $1000 to replace the CV axles. I never use the 4WD option. There is no load on the CV axles as long as I avoid 4WD. Why should I replace the CV axles? My personal mechanic quoted $750. It looks like the job is very labor intensive.