I did wonder about these:
Israeli military inflates aerostat demand - 9/12/2014 - Flight Global
Ok they're stationary but the Israelis seem to want them and they're not uav neophytes.
Very useful for keeping an eye on a stretch of wall (Israelis), or keeping an eye on troublesome neighbours outside of your FOB. The Americans seem to prefer the tower mounted system though. The persistence of such a platform is what makes it attractive, A UAV is better suited to other tasks.