As an estimation of your costs, using the minimum wage rate, $8 pays for 1hour of HALs. Assuming that each request takes 5 minutes, there are 12 monthly request, i.e. 3 request for week.

How are you going to handle people that makes more request or non trivial requests?

For a comparison, at the beginning of the class season I sometime listen to students that want to change from one classroom to another, or from one course to a course of a different topic. Just the trivial cases take 10 minutes, and in many case I have to go to the Students Office to request more accurate data so replying takes probably half an hour or more.