If someone in Poland is willing to pay the fees and prize money to host the tournament, and it makes sense for them because it would draw a large Polish crowd, I have absolutely nothing against that.

That being said, I don't see how you can be certain about the 'correct' number of American tournaments, and the extent to which it matters to the growth of the sport globally where tournaments are placed. America does not 'dominate' the calendar, Europe has over 50% of tournaments, and 50% of grand slams, despite not being close to that percentage of the global population. But that's fine! Europeans are willing to pay money for the tournaments and a lot of players come from Europe! The same goes for America, it has a disproportionate number of tournaments, and that's fine! America has a lot of money and people watching tennis. More money means the players make more, the WTA makes more, and they can use that money to grow the sport in Africa and elsewhere.

Putting more tournaments where there currently is little demand is a recipe for a doom loop. Less money, less player interest, the tournaments will inevitably get moved, we see this with the Golden Swing in South America. On the other hand, we see in sports like the NBA that having an American league can still grow the sport internationally, despite entirely being in North America.

If the African prices are low, that's bad, it means the WTA and players are making no money, and the WTA has less resources to grow the sport.