Imagine thinking that the massive spending power of the Greek economy has any bearing on the calls Giannis gets. 
Greece has almost nothing to do with it. Giannis is as big around the globe as any NBA player in history given globalization and the expansion of NBA popularity internationally. Just like how LeBron got away with a ton because of his popularity, such it is for international darling Giannis.
Tempting to go with:
Tell me you're too young for the Dream Team without telling me you were too young for the Dream Team.
Tell me you're too young for Yao Ming without telling me you were too young for Yao Ming.
&c.
But in matter of fact there's no way for you to actually prove your statement, so it's irrelevant. American talent still dominates the NBA conversation outside of America.