One and only reason to climb higher than 500m would be to get mountain scenery, but, dunno, such scenes are very uncommon and from, say, 1km altitude you do not really going to see much. I have 2 drones that can climb wherever, but, never had a need nor desire to do such stunt. Whole topic is way overrated.
If one wants to fly to a stratosphere despite the law and common sense - get an fpv racer on 6s lipo that can do 40m/s acsent and fly all you want - you are adults and it your decision to obey the law or ignore it. DJI produces vehicles that have to follow official regulations and it is, in fact, very good.