I'll give an example. I flew a lot in the Pacific Northwest as a FAA private pilot for years. But before that I flew mostly in Southern California. I had read about and studied "free" information available then such as the Aeronautical Information Manual (AIM), navigational charts, etc and some specific information about "mountain" flying. Washington has the Olympic and Cascade Mountain ranges that are around 8,000 to 14,000 feet tall.
Knowledge wise, I understood the words written and comprehended their meaning. Practically though, I felt it wasn't enough. So I decided to add one more item to my study, a Mountain Flying Course video provided by aviation safety gurus, King Schools. Even though I had been a former employee of John & Martha King, I ponied up about $129 for their Mountain Flying videos, where a huge part of the curriculum is watching John or Martha actually fly the lesson and provide instruction and commentary.
My study of King Schools materials actually saved my life when I had gotten caught in my first (and last!) "mountain wave" at 10,000 feet over the Cascades. Despite applying full throttle to my 301 HP airplane, I could not out-climb the winds that were pulling me down towards the face of the mountain. Instinctually I wanted to turn the plane around, but I remembered the instruction of the King video and just "rode the wave out" and continued up and over the face of the mountain safely. That one video made all the difference.
Now I get it, these are drones we are talking about here, and very rarely, if ever is it a life or death situation. But I do have thousands of dollars invested in just the hardware and there are people on the ground that could get hurt if I make a mistake, or I hit their property and damage or destroy it. When I took my FAA private pilot check ride decades ago, I'll never forget what my check ride pilot said to me as she signed off my logbook, "Now you have your license to learn!" And no truer words were ever spoken.
So whatever methods you chose to help you be a better, safer drone pilot, we should all support their choice. But for me, the more the merrier, no matter a cost or not.
Just reading your story brought back a ton of memories. One of my flight instructors told me, "There's flying and then there's Mountain Flying. They may look the same but they are not the same thing!"