There's just this thing... this revelation you get... this "Wow...Now-I-Get-It!" moment... this pleasure you get to experience over and over again... when you use a tool that's the most efficient tool for that purpose.
Like if you've ever done any decent wood-working or metal-working, you know what I'm talking about. That first time you use that high-caliber tool for a specific purpose.. and you're just blown away by how easy and precise it made doing that task... and here you are, you've been frustrating yourself for years and years "gettin' buy" with cheap-@$$ Harbor Freight crap. Dealing with the minor annoyances of it's short-comings. Telling yourself "Meh.. I don't use it enough to justify gettin' that primo one." And indeed, most of the time there is merit to that statement. But then you look back at how many times you've had to buy a new one cause it crapped out. Or how un-precise the cuts are from that low quality one. Or how many heads you've stripped or rounded over with those low grade tools. And finally you're just like "F*ck it... Why not?" and so you go for it. And then you're like "Oh NO WAY!!... Cool!.... NICE!" when you use that new one. And it makes you smile a little each and every time you use it after that.
And in this instance... hunting... it's harder to justify NOT investing in that high quality tool. Because A) You HAVE to glass, you KNOW this. B) Your eyes WILL degrade over time, you KNOW this. C) Once you've gotten that optimal tool, aside from any failure of it, or accidental damage, you know you're totally set in that department from now on. Especially since they have minimal moving parts. And your kid can always inherit it, further extending the service-life and benefit you'll get out of it.
You can get-by with lesser grade, for sure.
But that depth-of-field man... I'm tellin' you! It saves you lots of time. To illustrate what I mean by that. Think of a series of MRI image slices. For you and the doctor to get an idea for what's going on inside you... you have to scroll back-and-forth thru those image slices lots of times in order for your brain to piece together and visualize that thing you're seeing and getting an idea of it's size and placement and width in 3D space within you. Now imagine how much easier it would be to look at those MRI images if there was a way for your eyes to see all those slices altogether at the same time! THAT... is what I MOST noticed in the nicer binos right off the bat, the first time you put them to your eyes. This allows you to pan thru an area and KNOW you've much more realistically seen everything that *could* be concealed within that FOV... because you're not hampered by a thin-MRI-slice type of image, that would require a bit more in-and-out manipulation of the focus-wheel so you can feel like you've verified for sure nothing is there in that FOV. Hence a big time-saver! And it's gonna help you catch things you might not have seen otherwise, in terms of hiding creatures.
ALSO: Another litmus test for spending money on something you're hemming and hawwing about? Ask yourself... Have you spent money on stupid-er stuff? Chances are, the answer is Yes. So why not? As long as you know the expenses of your regular responsibilities are handled. Then go for it. RE: Money - "You can't take it with you." (when you die)