i agree that domestic players even if only average sell more jerseys than better foreign players, but only around their region.
frydek though should be a team that sells worldwide. they made it to the semifinals of bbb and have some of the best players off the world on their team. why would mello for example, a brazilian nt player with almost 100k salary as a pg, not sell his jerseys at least in brasil? the mavericks make quite some money with selling nowitzki jerseys in germany.
on the other hand is bb only in their 10th season and has some way to go to make the game more realistic while the main goal for the bbs will likely be to attract new users and make this a fun game for everyone from the beginning and i think nowadays its hard to run a new club, you hardly can afford players who are helpful. and starting the carreer with 15 domestic players might help to keep the new users