My right eye has some astigmatism. Not a lot, but enough to be a bit of a limiting factor in low light. I consider a scope to be part of ethical hunting with a rifle caliber, at least in some conditions.
I have severe astigmatism in my right eye. That's why, at an early age, I learned to shoot left handed and never looked back.
I do have a problem with the bow, have to strain to see those pins sometimes. In sunlight, they light up (fiber optic) and are a lot easier to see. I'm AT BEST 20/70 corrected in my right eye. But, I've gotten it down with lots and lots of practice where I can group into 4" at 25 yards with the Hoyt, about 9" at 40. I feel that's plenty ethical to chase whitetail and hogs with when it this bow season and I have not slacked off in my back yard practice.
With a bow, you have to HUNT, not just sit back at 2000 yards and shoot. Oh, I can shoot, but I prefer to hunt.
Like I said, though, I'm happy with my Burris riflescope. Doesn't mean I can't tell the difference; I just like the price/performance of the thing.
I totally agree on the cost/benefit thing. I'm not rich. I'd have to save up for 10 years just to buy a Schmidt and Bender right now, living off my retirement which pays the bills, what work I can get for spending money, and my wife's disability and I don't know if social security will even be there when I qualify in six years. I wouldn't spend it on a scope that costs as much as a Japanese motorcycle, anyway. If the only optics were high end European stuff, I'd just hunt with iron sights. I'm a very skilled marksman and could handle it even with aging eyes. Heck, a good receiver aperture is capable of 1.5 moa at 100 yards in MY hands from an accurate pre 64 M94 Winchester in .30-30. Some "experts" have tried to tell me that a .30-30 lever gun ain't accurate.
I like the higher end Bushnell, Weaver, lower end Leupold, and the Burris stuff a lot. The only scope that has ever let me down is a friggin' Simmons Whitetail. I don't do Simmons anymore. These 200 to 300 dollar scopes stay together, work well, and get the job done for me. The optics can't match my buddy's Schmidt and Bender stuff, I readily admit, but I'm putting a bullet on target at 400 yards or less, not reading a damned newspaper at 600.