My philosophy as well. Although our fields out here are huge, with standing waivers to 50,000 ft. for the TRA/PHX club. Another good reason to "overbuild a bit". With two HPR launches every month from September to May, most of my rockets get a lot of pad time. Today I packed our old truck "Grosser" for a one day launch with the Superstition Spacemodeling Society, the local NAR club. They have a new site a bit further South than the old Salome emergency airfield. No chance of drifting over I-10 now. Still planning to keep everything under 10,000 ft. until we get to know the area better. They have a call in waiver to 15,000 ft. MSL.