Even the quality things often end up pushing people into buying other things to go with the new quality thing - i.e. my wonderful new winter boots make my old winter coat look shabby, so I "need" a new winter coat and hat and gloves and scarf now too. Or the new kitchen counter makes the rest of the kitchen look like it needs renovating. Or . . . . I am sure we can all come up with lots of examples. ;-)
If you buy a very high quality acoustic guitar, it's usually a good idea to buy a hygrometer and humidifier/dehumidifier with it. The more expensive guitars tend to be made of solid woods and more lightly braced (makes the instrument more lively and responsive), and because of this are much more susceptible to humidity problems.
Typically an acoustic is built with humidity between 45-50% RH. alright to keep them between 40 - 60% humidity or for short periods (day or two) 30 - 80%. You can pull them out and play a show at pretty much any humidity for an hour or two.
But if you have them at too high humidity for too long, the wood swells causing the bridge to raise up. This lifts the strings up too high off the fretboard making it hard to play, and if left for long enough will permanently deform the top. Sometimes the glue for the braces under the top will actually loosen and they'll come off and start buzzing. If you have the guitar at too low humidity the top will shrink. This makes the strings sink down and start buzzing . . . the wood itself will start to develop cracks on the top. Sometimes you can fix the guitar, but sometimes this damage means that you junk it. I have personally destroyed a guitar this way.
Ironically, the cheapest acoustic guitars tend to be immune to this. They'll often have laminated woods which don't swell and shrink as much due to water levels, and are usually very heavily braced. That's why you can find old Harmony or Stella acoustics that have been dumped in someone's attic for 50 years and they're still in OK shape. Sound like a rubber band stretched over a carboard box, but no humidity problems.