Many in the hobby don't want to face the reality that the market for our kind of hobby cars is shrinking as we old goats get ill or pass on. That's not to say that all the buyers have disappeared, we just need to work harder to find them than we did, oh say, 10 years ago.
I sold my '39 deluxe sedan earlier this year. It was before most of the country had good enough weather to be interested so I just put it up on C/L locally, figuring I'd get more aggressive in posting at larger distribution sites later if it didn't sell. As I expected, I got light local interest, a couple tire kickers and one guy who looked at it hard but couldn't get past his wife. The ad even got posted on Bring a Trailer which sent it world wide, but that only got me emails telling me how nice it was......gee, thanks guys. But then, a guy down in California used one of those "programs" that search C/L nationwide, we corresponded, he drove up, and took the car home.
As for foreign buyers, yeah, scammers can be a problem. On the other hand, last year when I sold my traditional hot rodded '30 hiboy the most serious/fastest acting person was a fellow in Japan. It took a few days for the bank transfer of funds to go through the international hoops, but otherwise it was a smooth sale.
So, you never know where your buyer is, but like many things in life, success (and "luck") results from effort.