What the money buys at each level
Hourly help is the smallest unit. A family books two or three hours to build a school list, or to have someone read an essay who is not the student's parent. This is the cheapest way in and it is often enough, particularly for a student who is organised and only needs a second opinion at two or three moments.
A comprehensive package is the other end. It usually means regular meetings from junior year, a built school list, essay work across several drafts, deadline management, and someone on the other end of an email in October when something goes wrong. The price reflects the hours, not a different quality of advice.
In between sit fixed-scope engagements: an essay package, an application-review package, a single-year package. These are worth asking about explicitly, because a counselor whose website only shows the comprehensive figure will often quote a smaller one if you describe what you actually want.