I reckon 150 for half hour is a fair value as long as the service is appropriate and meets expectations of a customer.
In the past ,I had bad and good experiences with TS girls. So , can understand to a certain extent doubts about the "too high value". With no disrespect to TS ladies in Ireland ,there are a limited number of decent ones , who do look the same as on the profile pictures and are able to deliver what they claim they can, and these deserve being paid even more..
Miss Rammer is the one of those.She can literally read your mind and take you where you wanted to be..and even further ...I was really lucky to meet her.