In private-practice teaching, there is minimal job security, there is no tenure, there is no collective bargaining. The way educators in private practice stay in business is to deliver a better product at a better price than their competitors. Competitors include not just other private-practice educators, but also the programs operated by the schools, for a school is unlikely to turn to contracting if it is satisfied with its in-house program.
The beneficiaries of this kind of competition are the schools and students themselves. Since the private-practice educator must compete to win the business, he or she is under pressure to keep prices low and service-quality high.