Question: If an educational company described their session methodology as "high in reach" does it mean:

1. the size of the audience
2. the effectiveness of the training
3. other?

The original sentence in a press release was just "Our trainings are low in cost, high in reach".

I see that this comparison with cost is sometimes being used together [for example](http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2957672/) "*Our interventions must be high in reach but low in cost in order to most persuasively demonstrate worth in intervention*"

Answer: 
It's a somewhat vague term, and can be interpreted in several ways. But think of a person simply jumping to touch the highest point on a wall that they can achieve. "High in reach" basically means challenging you to reach as far up as you can.
"High in reach" in this context would mean the goals are high but within reach. It's a motivational phrase that you have high and lofty goals but with your abilities they are well within reach, or that you are well within your ability to meet those goals.