Why are used BMWs so cheap?

I'm shopping for a new car and my budget is $30,000. I've been looking for a while now, struggling to find something I like, and the used BMW 330i continues to feel like the best value by far. I just don't see how these luxury cars can be priced the same as a used Ford or Japan car. Why are BMWs discounted to such a degree? And I know people say BMWs aren't as reliable as Toyota/Honda/Lexus/Mazda but are there any models that are exceptions? Are there any modern models that can easily last 15 years and do 150k+ with little to no issues?

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