Gray Ghost, Good question... I believe that you hit several of the key points in your question. More experience gives way to more skill. Then with increased research, that puts you in a spot where the good stuff could be. After in a spot which holds possibilities comes the persistence and with a little luck you will make some good finds. I am not one to brag but I do have a bunch of experience and hunt with my brother most of the time. We have both detected for over 36 years so lots of experience!! No the skill part, I must admit that my brother has much more skill at detecting than I do. There isn't a detector he hasn't used and learned to it's max. On the other hand I have used many detectors but would be the first to admit that many of the machines in my past I either didn't keep long enough, or never bothered to learn every little thing they were capable of. I would venture to say that there are many old timers like my brother and I that can use an older less state of the art detector and get very good results simply from experience with a machine.
For an example I dug a silver 3 center about 6 years ago, and my brother who has found many many nice old coins, stated many times that he probably would never find a silver 3 center. Well, just this past summer I called him to go detecting and he wasn't feeling well so he said he'd need to take a rain check. So I went on with my plan to hunt an old vacated farm site having been a corn field for the past 50+ years or so. I had only been at the site about 15 minutes and dug a 1839 half dime , so I immediately called Digger, my brother, on my cell ph. to tell him of my find. He was excited but I could tell he honestly wasn't feeling well. I again tried to get him to come hunt the site with me and he explained he just didn't think he could. About 15 minutes after our phone conversation my cell phone rang. Yep, you guessed it, he had decided to make the hour long drive to my new hunt site. I continued to hunt and in about an hour he arrived. Within 10 minutes of his arrival he dug a beauty of a silver 3 center. In my opinion all of the above mentioned reasons were involved in his finding his 3 center along with his extreme desire and persistence. Oh, also the competition we have is also a driving force of our finding good stuff. Although when one of us make a good find we both feel like we made the find because when I make a the find I let him crumb the soil from it and he does the same by letting me crumb the soil from his good finds. Makes for a fun outing all the way around.
By the way I think we are both a bit lucky in many ways.