I doubt I will ever take a 500 yard shot while hunting.
With that in mind it isn't worth the added cost to me. I zero my scopes at the highest magnification and know the SFP scopes will be calibrated at that magnification. But I hunt with them on the lowest magnification virtually all of the time. My scopes will all be 2X, 3X, or 4X on the low end and I can make hits out to 200-300 yards on those settings without worrying about multiple aiming points.
If I ever need to take a longer shot at game, or shooting longer at the range, I pass right over all of the mid-range settings and go to max magnification. For what I do, and at the ranges I shoot everything in between isn't needed.
If I were using something like an 8-32X scope, even the 5-20X you're considering, then I can see some situations where something in between might be useful. But for big game hunting out to 500 yards a scope that tops out at 14X is more than enough.
