I think it is fine for a therapist to charge for the time they spend on services to you. My daughter's T charges for any phone call over 10 minutes. My worry with the unlimited emails for $100 is that if the therapist allowed that, he/she would quickly become overtaken with emails that would take up a ton of his time. (I doubt my T would do this as he practices excellent self care.) In some ways, that policy of unlimited (substantive) emails for a price suggests a therapist who is unable to set boundaries or a therapist who has very few clients and lots of time on his/her hands (a therapist new to practice?). I know my therapist would be unable to offer this service as he has a full practice. It's hard enough to get an appointment with him. If a therapist needs to charge for emails, I think it would be better to do it on a per email basis so they don't get overrun.