French GP - Not at Le Mans

I wonder how many more countries of the world it is possible for F1 to expand into?
I also question how many of the countries currently holding a race have the wherewithal to continue to do so in the future. Once they've held a few races and established themselves on the motor racing map, will they opt out of F1 and host cheaper racing series instead?
I wonder how much Bernie charges for a country to hold a race each year? A multi year contract must be a big commitment for race promoters in countries with weaker economies.
Apparently, hosting the GP was costing Turkey $20 million per year, and they couldn't sustain that expenditure for long. On top of that, Ecclestone wanted to double their fee for hosting the race. I can see several of the "new" races going that way too.

We would all like to see races return to F1's traditional European homeland, where the countries and circuits have the own character, instead of these nondescript Hermann Tilke circuits at the new races.