I can comment on this as I'm kinda that guy at my rocket club as well. Basically many RDF or GPS Trackers in the hobby rocketry community operate over 70cm and require a license for legal operation. Add to that many people buy trackers and yet don't fully familarise themselves with their operation. So you'll have someone with a GPS tracker that has no idea how to get coordinates "out" of the system or what to do with them when they have them. And GPS is the easier system to use as RDFing a tracker (foxhunting) is more readily described as a skill or even an art. It definitely takes practice to become proficient at these types of things. Add to that the fact that many GPS systems are different from an operating perspective and you have a bit of a steep learning curve.