Didn't they cost between $1,000 and $1,500 when they were released? I'm specifically referring to laptops in the OPs price range.
I've literally owned dozens of laptops that cost between $400 and $800 (some on release) which lasted maybe a max of 2 years. Some didn't even make it 12 months.
What I'm saying is that you get what you pay for basically. There are definitely outliers, but generally, I find the cheaper stuff doesn't last long at all.