Sure, you can do that in certain parts of LA. But you can see these ruins almost everywhere in Detroit. It's really one of the most depressing cities I've ever been to.
Yea - Detroit is a sobering experience. I was honestly in shock the first time I went downtown. Bad parts of town and abandoned or nearly abandoned plazas are not new to me, but the scale of decay in Detroit - 20,000 people on the streets! - is overwhelming and depressing.
I get your point that there is "ruin porn" in almost any city.
I don't think you get my point though. Detroit is almost entirely "ruin porn", there are no million dollar homes next to any ruins in Detroit, I doubt there are any million dollar homes in Detroit at all.