Of course. I am not saying this definitely doesn't work anymore, but it still looks like Google broadened the ways in finding multiple-leveled exchanges.

This is an interesting link which could be helpful in understanding Google's reasoning.

The related part starts from here:
"My favorite for the real estate licensing site is that in less that a minute, I was able to find 50+ other domains that this person had–everything from learning Spanish to military training."

BTW, have you SEO-ed more sites in the same period? If so, what are the results?