>The vast majority of games below 1800 are won or lost via a tactical sequence rather than a deep long-term strategic idea. <
Yes, thank you. Excellent point. And so it goes with we poor 90% of the chess world...we are going to win because we can create tactics out of our opponent's blunder. Do you see that in GM games? Almost NEVER. You do not play like a GM. You almost certainly never will. So why study their games?
Enjoy them, sure! We all love watching good golf or football or whatever our fave sport is. But let's not kid ourselves that we will become like Tiger Woods by buying his equipment, watching him play, or even hiring his swing coach.

>I don't think most players under 1600 are going to make this serious of an investment with their time and money. <
Hmm. Depends on how you define a serious investment of time and money. There are some casual players on that list, I'm sure. But not so casual that they didn't pony up to join the USCF and go to enough tournaments to get a non-provisional rating.
I was just at the Chicago Open, where about 750 players attended. About 300 of these were in the under 1500 and lower sections. That's 300 mediocre players who shelled out $220 each to play chess. Most of whom, I'm guessing, have played in many tournaments, and most of whom, I'm also guessing, have been studying master games for a long time...in Chess Life, in books, and on the Internet.
And all of whom are still rated under 1500.