They lessen the waiting time for these paid interpreters to appear. Emergencies can be dealt with in a more effective manner. Health matters can be administered in cases where time delay could be critical. Potential liabilities are reduced!
Doing a search revealed 41,500,000 places on Google that offer ESL locations, material and programs. The Internet TESL Journal
Let us give thanks to these proponents of teaching and learning English as a Second Language.