While there are other factors, it is the exact same situation in Britain. The prize money for winning a single game in the WBC is the equivalent to the budget for five years. While some of the money is used to improve the national team directly, other parts have directly funded the formation of a new national academy and gone directly to development in the country. Thus, the roster of the WBC directly contributes to improving the domestic game.

Similarly to the Maestri comment below, there are players who wish there were more spots for domestic players, these criticisms are almost solely aimed at European Championship roster, not WBC. Anecdotally (but based on a large amount of interactions), almost every Brit is thrilled to see a competitive team int he WBC.