Anyone (everyone) care to throw a dart?

Price point on hearing aids?

I'd advise for you to visit an audiologist. They can determine if you've lost any hearing. My grandpa is 92 and can hear as well as I can.

Were you exposed to sounds that were too loud when you were younger - for extended periods of time? Can you hear someone calling out to you a few feet away?

As humans, we hear midrange frequencies with better accuracy than treble or bass. I would also say...it's not about how much you spend - but what you buy. There are plenty of great deals out there...

Price points are individual.  
I couldn't guess yours.

The existence of diminishing returns and diminished hearing are not in any way, matter, or scope related, correlated or relevant to each other in any meaningful, significant, or substantial way.