Even the lowest rated players on your team will earn you a healthy sum; a 60-overall player, for instance, will go for between 12,000 and 17,000 coins. A one-off sale here and there won't make a big difference, but if you sell 20 or 30 at a time, you'll have a nice chunk of change to play with, and you’ll be closer to affording the international superstar of your dreams.