Seriously, before the western hunt, save up and buy a used pair of alpha glass, with the plan to sell them after the hunt for what you paid. I've done that at least 3 times with the same 554 Kowa spotter over the years. That's in addition to all the buying and selling from season to season that I do. Even losing a hundred bucks or so is less than renting them.Great points by @hereinaz and @Jake Larsen.
I spend 4 months in the southern whitetail woods, and two weeks out west roughly a year and the argument to upgrade binos keeps getting stronger. At least I can convince myself, I am giving myself the best chance to see critters ( to one of your points - cant kill what you cant see)
my wallet hates rokslide. Let us know what you decide OP!
The problem with that plan is, you won't sell them...