introduction

she will introduce you to the higher end of the market..these ladies are more into seduction rather than production..

...Possibly she refers to her one hour sessions as "Introductions". (Introductions as in getting to know each other "well".) Without any further info this makes me think she gets 500 for an hour session. It's a term that implies an hour is a short amount of time for a session. I've seen many ads and web sites where the provider has "titles" for her sessions based on how much time. Two hours may be called "Passion and Temptation" and so on. Selling the longer time as a better time.

 This is speculation but it's as good as any at this point.

1 hour "Introduction"
2 hour "Rendezvous"

You get the idea.  More or less I think when they say intro it's just another way of saying a brief encounter.

It's just a catchy name for the appointment length.

All kinds of names: trysts, getaways, hours/days in paradise/heaven, secret rendezvous, etc.

In 60 min. it's not a "leisure" date, it's an "introduction." That means it is your first meeting most likely and that rate is 500 for an hour.