With investments, people do get unnerved when there are big drops, but you (should) diversify, accept that you win some and lose some, but hopefully come out with decent gains over the long term. If you have a heart attack every time the market drops a few percent you're going to make yourself crazy.
That said, I think everyone pinches pennies on some things and thinks nothing of spending money on other things in ways that often aren't rational.
> which sometimes drops 30% or more, costing hundreds of thousands of dollars or more of losses.
1) This is entirely ignoring the fact that the stock market goes up more often than it goes down. Similarly, tech almost only decreases in value. A $100 webcam might be a nice upgrade, but it will never transform into a $200 webcam.
2) A dip in stock price isn't the same as actually losing money. If you're gambling your money on meme stocks, sure, unsafe bets exist. But otherwise, a 30% dip one day is meaningless without context. The S&P500 dipped 30% over the last week of March 2020. If you put in money in February 2020, watched it crash, held through to today, you would still be up 25% from your initial investment.
Possibly your question/comment would resonate more with people if you compared the spend on a microphone with the spend on a suit, or a pair of shoes. It's easy to see the value of quality there, for appearance, comfort and health.
In the case of a microphone, the purpose is to communicate your thoughts, and to make a good impression, so the investment keeps working and giving you a return on investment for longer than the first few moments. And a good mic will last longer than an article of clothing.
A good mic is a great investment.
I'm more baffled by my/our inability to correctly assess our bad habits. A $100 item costs the same as, say, two $50 dinners - and unlike those, the item will stay with me for months or years. Still, I'd find it pretty easy to pay for two dinners in a week, but I'd agonize on pulling the trigger for a single purchase of goods.