Just me, based on my own experience – I would already have sent her home from the trial, with a ‘thanks but no’.
No way would I buy a horse with repeatedly high readings.
My OTTB gelding who was treated twice for EPM came close to full retirement when the first treatment was slow to see results. When he couldn’t seem to remember how his feet were supposed to coordinate smoothly with each other. I have lost a lot of riding time to the periods when he isn’t so coordinated. And, the problems came back later, after the first treatment. There is no guarantee that he’ll continue to stay symptom free. Or that he’ll be able for whatever riding might otherwise have been some easy fun for him.
This is the thing to note – Simkie’s strategy is one of a short ownership cycle. If the horse has no neuro symptoms at purchase, then even if they have some degree of EPM it is unlikely to be a factor over a short period of time. Possibly Simkie’s buyers aren’t testing for it, so it isn’t a factor in her sales? If I am understanding Simkie’s post correctly.