I’ll clarify. Not all the prices in Denver are going to be that high since Denver is large. My example from Speer Blvd was likely a worse case scenario since it’s downtown Denver. Not on the edge of the city limits like 9 mile.
You said you can’t imagine the prices being that different in Denver. In some parts, it is. The deals you posted at 9 mile are not representative of Denver as whole. Likewise with the more expensive downtown locations.
Being an expat still comes with tax obligations to the US, no matter where you live in the world. I moved to Germany but I still have to file US taxes every year unless I renounce my US citizenship someday. That’s one the most notable downsides that I can think of.