Once a course is done and WGT has recouped its costs from the first several thousand players, it makes a healthy marginalprofit from each additional player who tees off.
Much of the development cost of a new drug is paid by the US market (yes, this is why you pay higher prices than most Europeans do) meaning that as long as drugs in, say, Greece are sold at above the marginal cost of production they still make aprofit.
The company should already be charging the most it can for that marginal phone call and a change in sunk costs might affect accounting profit but not that revenue maximising price charged.