TopShelf2010:Your Club Earnings are a Total of your Member's Earnings if I am not mistaken. These are not credits that you can spend.
You are not mistaken, it simply is the cumulative earning your members have made in their WGT career, of which has probably already been spent plus some!
Not to be confused with the CC Bank....which is "coming soon".....or coming on the twelfth of never. This was designed to have a kitty for CC tourneys I assume, but in typical bungling WGT fashion, had no idea how to actually implement it. IMO it would have revolutionised CC's that were honest, and would be abused by CC's flourishing with multi-accounters.