So, guys extend because they altruistically want to save the company money and not because it's an easy way to make some jack? Bottom line is that the company would need more pilots if guys didn't extend.Close, but no cigar.
When the itinerary calls for a pre-positioned crew at a tech stop, say in Anchorage, to conduct a long range flight, the customer is billed for those expenses.
When the crew has to be swapped out halfway through a trip, say while the customer is doing his three days of business in Beijing, the COMPANY eats the expense. Just as if the customer was in Toledo for three days and it was time for the crew to go home.
Customer convenience: customer pays.
Company (or contract) convenience: company pays.