Look. I own not one but two 10-needle embroidery machines, Space Girlfriend Bobbie Draper and Space Boyfriend Poe Dameron, and a serger, and a sewing machine, because, you know.
I own a business and use them to make products which I sell.
The sum total of the sewing and embroidery machines which the business owns is about $22,000.
Of that, our sewing machine was $299.99 because we got it as an open box. We bought it in 2018 and Emet and I have used it pretty close to daily that entire time. If we'd bought it new, it would have been $399.99.
So like, even if you're buying a sewing machine for professional use, which, like, I have to stress, is absolutely what we bought it for, spending a thousand dollars on it probably isn't necessary.
The only thing I'd recommend is not buying new Singers, because they're ... hit-or-miss at best. If you can find an old sewing machine -- like, a Singer or Kenmore from the 60s? -- at an estate sale or garage sale, you'll probably pay $100 or less and then maybe $25-50 to get it cleaned or tuned up, and you'll have a workhorse you'll pass on. The old Singers and Kenmores had metal bodies and were sturdy as hell.
This idea that people can't reasonably inexpensively get a sewing machine which will allow them to alter or even make their own clothing is very silly. I live in a city, and it took me literally less than 5 minutes searching "estate sale sewing machine" to find 7 different estate sales going on today which included a sewing machine that I could have theoretically gone to purchase for less than $200.