The contracts they signed with the government doesn't guarantee them any number or percentage of loans to service. By contract twice a year the federal government evaluates the loan servicers and decides what percentage of existing and new loans the servicer will receive. The contracts even contain terms which allows the government to completely block servicers from getting new loans at the government's sole discretion. Servicers also get a bonus depending upon percentage of loans they service which are in default. Reducing the loans would reduce the percentage of loans in default which means more bonus for the servicers.